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I'd start with paper tuning, stuff every archer should do then start adding things to do on your own. Learn how to tie nice servings and D loopsLearn to cut and wrap your own arrows, along with installing various inserts and knocksThen you'll be ready for a bow press.
Depending on the type of bow you have you can build a bow press for cheap. I did it for about 30 bucks. Working on them is pretty easy.
this is my bible. helped me a ton. and then some.http://www.amazon.com/Bowhunters-Accurate-Shooting-Complete-Hunter/dp/1589231473