I agree that when you go to look at a prospective purchase you should take along somebody who knows T's and will know what to check and will notice what's missing and have some idea whether the missing part is a big deal or not.
I also agree about the T being different from anything you've worked on before. It's simple, but often not put together the way you expect. That's why the first Model T parts every new owner should buy are the Ford T shop manual and the MTFCA books on The Engine, The Transmission, The Electrical System, etc. If you just dive into a repair without any warning of what not to do, it can get expensive. The books can save you a lot of hassle and dough.