Practice, practice, practice. It makes perfect.

I went through a tobacco rolling phase, and hundreds of joints later, I'm a joint rolling champ. If you don't smoke tobacco, just roll your bud, and if the joint doesn't turn out well, don't be afraid to tear it up and start over. Nothing wrong with that. It'll give you practice.

A good joint is tight, but not too tight, as you won't be able to hit it. Experience will give you a feel for it. I promise.