All I had to do was watch my parents roll a couple and I instantly knew how to roll perfect. You might not believe it but when I rolled my first freehand rolled joint it turned out perfect cone shaped and everything.

What I/they/we do is i just put the paper down fill it up with a good ground up mix, pick it up and just roll the paper up and down until the weed it kinda packed into a good joint shape, tuck the fold closest to you under the other, roll it up so just the sticky side is up, lick and press and there you go a perfect joint.