I agree, there's a million little things you can do to help ease the pain, but since you're always using/moving your jaw, it takes soooo long to heal. I've had tmj for 2.5 years and i'm still trying to figure it out. You just have to find out what works best for you.
I have tmj from a car accident that displaced my disc and disrupted both sides. I've learned so far with trial and error that good posture, sleeping only on my side with my jaw supported on my pillow, weightlifting and doing exercises to keep my upper back/neck/shoulders strong, and basically any exercise that is good for you... yoga... it all helps. I wore an appliance and it helped for a while until my jaw became tolerable, then i stopped wearing it because at the same time, it was agitating my jaw muscles.
For months after the accident, i couldn't talk, chew, open my mouth, brush my teeth... nothing without horrible pain. With exercises, a soft diet, wearing the appliance, and months of PT with the electric shocks and all that--that's when I started to feel better.
I've heard mixed reviews about the mouth guards at stores, there's so many kinds of splints and appliances out there now... but i guess if you try it and it helps, then that's all you need.
One massage technique i found that helps is if your tmj flares up, rub your temples in the direction from your face to the back of your head (not in a circular motion, just front to back). your joint muscles run all up and down your face, and this area, if rubbed, helps ease the tension.