Exactly. All the sights, scopes, pointers, and whatnot aren't going to make you any better if you don't use them.
The best way to aim better is practice.
To add my lucky shot story to the pile...
I made it with a blowpipe. No scope or sight, semi-auto feed, or anything. Just a 30" chunk of 1/2 in. PVC and a micro dart. My friends and I were nerfing indoors, (Seattle in fall. Rain city) and my friend's little brother was hiding behind two folding metal chairs with a blanket draped over them. There was a little tiny notch in the blanket between two of them: It can't have been more than two inches wide and three tall. I was twenty-some feet away, and I could just barely see the top of his head through the gap. I made the hit. (Didn't win the game, though. )
The only way I could have made that shot was by tremendous amounts of practice. I've been playing with that particular blowpipe for several years. If I had just started using it that morning, would I have been able to make that shot? Probably not.