i too am disable and use a crossbow. i use a Ten Point x-bow.
www.tenpointcrossbows.com. take a look at them too, these things aren't cheap, but it is good to see what is out there before you buy. i like the acudraw that you can get with them, it makes it really easy to get the bow cocked. this is only my 2nd year using a x-bow, i'm sure i still have afew things myself to learn about these things. try the different bows out before you buy, it needs to fit you.