Buy the very best you can afford plus a bit more and use and enjoy them.
Definitely try before buying, or buy somewhere reputable with a good return policy.
Reputable dealers understand that there is no "one size fits all" in binoculars.
Best of luck.
Binoculars are one of the most wonderful thing which I have enjoyed during a (rather) long life.
Birds are an unusually beautiful way to enjoy using binoculars, but almost anything can be used as an excuse to look through them.
The better your optics, the better you see ............ it is that...
I would say 1. decide how much is the absolute most you want to spend. 2. get advice and read reviews on what is the best glass for that price. 3. buy, use, and enjoy, secure in the knowledge that you got the best for your eyes, for the money you were willing to spend.
Don't look back, don't...