Hi Kristen! Welcome to Bird Forum.
My wife and I made our 'once-in-a-lifetime' trip to Kenya in 2008. We've now been to Africa seven times! The same may happen to you! Enjoy it!
On our first trip, everyone was looking for lions and elephants and so on. Us too. But I also looked around for birds, and found 150 species in eight days. This was my introduction to Bird Forum. I asked about twenty species, and felt bad about being so ignorant. But of course, in the background I had spent a month studying books to identify the other 130 species by myself!
And a good thing about your post is that you have obviously spent a lot of time trying to identify your birds (occasionally people post here on BF because they are too mean to buy a bird guide or too lazy to use it).
Some BF members don't reply to threads where the photos are not posted directly on Bird Forum - and yours are on Flickr. But don't take it personally. BF is a great site, and some of us feel great loyalty to it, having learnt so much here, so we like people to make their main effort here. Also, one of the things is that on BF you can drag and drop the photos to the desktop and lighten or darken them (or otherwise adjust them) to help with ID; you can't do this from Flickr (I think; I don't have an account and don't want to make one). Maybe you just disabled downloading, but it can make it more difficult to id photos.
Also, although I started to look at your photos when they were first posted, I took a break when I realised how many there were, and how difficult it would be to navigate around them on Flickr, while trying at the same time to answer on Bird Forum. And now you've deleted some stuff, I'm even more lost.
I'm not an expert on these birds, but obviously I know a lot more than I did eight years ago. I will give an opinion which will also 'bump' your thread to the top of the Q&A section where some others may join in. These others can then correct any of my comments which are wrong.
But if you want to, you could pick the two or three birds you are most unsure about (e.g. Long-billed Pipit) and make a new Bird Forum thread with just these birds uploading the photos directly to BF: you can work out how to upload photos to BF, and I'm sure you will get answers from people who know a lot. To post photos directly here you go to 'Additional Options' > Attach Files > Manage Attachements and click, then find the photos you want to attach on your computer by browsing (maximum five photos per post, but as many posts as you like in one thread, or you can make multiple threads with different titles; maximum photo size 1000px, and there is a maximum filesize also; adjust the size and quality of your photos before posting).
In any case, as Larry said, it would have been really useful if your Flickr photos had a number as well as your ID to make them easier to refer to, given how many there were.
You may have deleted some of these from Flickr, but I hope you can work out what I am referring to.
Booted Eagle looks OK
Brown Snake-eagle looks very OK
Crowned Hawk-eagle juv or Martial Eagle juv? Seeing the front and tail would make this easier.
Tawny looks good
African Hawk-eagle seems right.
Chanting Goshawk - we can't see the front or tail of the bird, but might Gabar Goshawk (eye dark but not obviously red) or Lizard Buzzard be possible?
Common Sandpiper and Ruff looks like two Ruff to me (both have red legs)
Common Sandpiper: I wonder if this group is Curlew Sandpiper? In my experience Common tend to be solitary, and the bills of these birds seems decurved. Also Curlew Sand is said by the books to be very common in SA.
And I think the bird behind the Ruff in the next photo might be Curlew Sand also.
I think the 'Unknown' bird might be Sabota Lark (could be some other lark, but it has red legs).
The next two 'Lark?' photos look like Spike-heeled Lark to me.
Rufous-naped and Sabota look good for the next two birds to me.
Spike-heeled Lark again.
Karoo Long-billed looks OK to me, but I've never seen it. The books say it would be at the extreme of its range in Mountain Zebra NP
Large-billed Lark: again, I've never seen this, but your ID looks good to me.
Rattling Cisticola looks good for that location for the first two photos (same bird).
The next two photos from the iSimangaliso wetland look more like Rufous-winged or Levaillant's to me. I'm not sure if you can tell these two apart without seeing their backs (unless you recorded the sound).
Next two photos: Rattling? Could be.
Levaillant's look OK, but Lazy shouldn't be in Mountain Zebra NP (more Levaillant's?)
Wailing> Karoo Prinia as Andy said
Cisticola Species: Yes, but? (Ratlling again)
Have you removed? Unknown: ? Black-chested Prinia?
Have you removed? Greencap Eremomela: ???Tiny Greenbul (out of range, but has been seen)???
African Dusky Flycatcher looks good to me for the next few
(But I'm really bad at these African flycatchers)
Ashy Flycatcher: I'm not sure this can be identified from these photos. Why wouldn't it be Spotted Flycatcher, for example? For Ashy, shouldn't the tail be blacker and more fanned? But on location, I suppose it might be.
Again, on location, it could be Grey Tit-flycatcher, but African Dusky is also possible there
Maybe someone who is better than me at African Flycatchers will come along and comment
Maybe the grey-coloured sunbird (labelled 'Sunbird') isn't Grey Sunbird (it lacks green sheen and red wing tufts)? Maybe it's female White-bellied Sunbird.
I think the coloured sunbird is Marico because the bill in some photos looks strongly decurved (and the books say Purple-banded is not). Also Marico is so common; I've lost count of the times I thought I'd found something else only for it to be Marico). And the next two in the very over-exposed photos, would be the female Marico (again decurved bill)
I don't know about the pipit: Long-billed or African. We can't see the tail. The underbill appears pink, not yellow which might even indicate Buffy
Red-collared Widowbird looks fine, especially if you saw some breeding-plumaged birds in the area
And the Fan-tailed Widowbird: who knows?