Level Of Effort: Small
What You Need: Skinny or straight legs jeans (this is much harder to pull off with looser fits, so just save those for making cut-off shorts—another easy DIY!), sharp scissors, tailor's chalk, a ruler.
How It's Done: Before cutting anything, experiment with different inseams in front of the mirror. Once you find what crop best flatters you, tag the spot with chalk. Then take your jeans off, use the ruler to make a guide line and cut. Repeat the process on the other side, and exaggerate the fraying by pulling a few threads loose (a few washes helps with that, too).