First, I think you should find an experienced hunter to hunt with and learn from. Having a mentor who can show you the ropes and assist you in field dressing would a highly valuable asset, especially if you have a disability that might cause you problems in the field. Check with your state and local regulations to ensure whether or not you have to be in a treestand to in order to hunt deer. If you haven't already, take a hunter safety class. That may also be a good place to find a hunting partner, come to think of it.
Also, practice, practice, and practice some more with your rifle, especially from field positions you intend to use, not just from a shooting bench.