You said you had a .357 rifle. Practice dry firing that at home. Put it over the back of a couch, on a cushion on the table, etc. Practice the fundamentals. When you get good at the trigger pull, put a coin on the barrel and pull the trigger. If the coin stays put the trigger pull is good. Iron sights can be hard to use at times. If you can, get good with a scope, or a red dot. Either will work ar 50 yards with a .22. When you get consistent good results with a scoped rifle, practice with irons. You would want to do it in that order to take all of the variables out, so you know what you're doing wrong. Good luck.
I own to many AR pattern rifles, I guess that would make me a hoardAR