One final though which is perhaps an expansion on what has already been said - consider your location relative to what you are hoping to find, and also in context of the landscape.
Somewhere like St Abbs head and Tor Ness are obvious locations for finding migrants, and as a result there are (presumably) people who covers these sites very regularly. Use google (other maps are available) to figure out what other areas look good, and where there are reporting gaps - a quick look from my available resources and cross referenced against google maps would suggest a good and potentially underwatched areas could be Pease Bay or Bilsdean. A larger site with a variety of habitats will increase your scope (assuming you are not solely interested in land birds), but try to keep it to a manageable area (an hour to cover on foot) and close enough to home that you can make multiple visits (even more than once a day if possible).
Hope this helps!
