I'm just learning since having my rotator cuff surgery, but I can give the hints that I have learned.
1. you are gonna lose 2-3 inches from your draw length. I normally shoot bows 29.5-30 inches, and I'm shooting a 27 inch bow with a tab.
2. Turn the poundage way down for the first few sessions, but once you learn the mechanics behind pushing the bow out with your bow arm, you can be shooting moderate poundage relatively quickly.
3. Hold with your back teeth.
4. Getting the tab set to where you bite in exactly the same spot every time is the same as your anchor point. If you don't do it, accuracy will suffer.
5. I've tried many different materials, but a small dog lease, about 1/2" wide, folded over on itself and hand sewn worked the best for me.
I hope this helps someone..........Don't give up.
I tore my biceps tendon and shot for several months. Actually set up a lefthanded bow because it was my left arm that was torn.
Great advice above. Start with a light bow. My first few shots I was scared my teeth would fall out. I was way too tense and my neck and teeth hurt. The next time out I relaxed a bit and by a week I was shooting better with a mouth tab than with fingers. The toughest thing was nocking the arrow with only one good arm. That was the biggest challenge.
Don't be afraid to try it. As Kidwalker says, its eaiser to hold at full draw than with fingers.
I just put a piece of dog leash on a D Loop.