DonA - Don't sweat about the recruiter not calling back; they know if you seriously want to pursue the AF as a career that you will not be shy about doing a lot of your own legwork to get everything together for an OTS package. For active duty, be sure you are talking to the officer accession recruiter for the area. You can either be scheduled for the AFOQT through them or can get scheduled on your own. If there is a MEPS (military entrance processing station) facility in the area, they offer the AFOQT, as well as any ROTC detachments at local colleges. Get the ARCO study guide and practice the tests out of the book. It's a little harder to find a BAT testing location, but the above places (MEPS/ROTC) may be able to point you in the right direction. There is no way to "study" for the BAT, as it primarily tests memory, multitasking, motor skills, and has a psychological test as well. I wouldn't be able to classify it as "hard" or "easy", but it is pretty intense as far as what you are required to do in the time you are allotted to do it. After you complete the AFOQT and BAT, you will be assigned a PCSM score which is a determining factor in your selection. You will also need to complete a lot of paperwork (from your recruiter) to complete the package.
If you do a Google search, you should be able to find some more detailed information. You may also want to search around on Baseops.net in the pilot selection forum for more information. Remember - no one is going to hold your hand through OTS/UPT, so do some homework on your own and you'll probably find a lot more information for your specific questions!