Still a beginner . . .
But I noticed the following really help.
-Make sure to lower my head like a turtle pushing his neck into his shell. Not sure if this is correct, but it helps me to have proper alignment with my sights.
-When gripping my pistols, I find I shoot more accurately if I push my palms fairly hard into each otheron the backstrap area. Again, not sure if this is correct or not, but it helps me.