I'm not going to bother warning you. If you can't be trusted with scissors, don't do this.
I apologize for the already cut belt, but I was making a fence at the time my belt broke and didn't think at the time to take pictures cause I was in a hurry to get back to the fence. But hopefully you'll get the idea.
The only materials you need are:
Scissors and a small flat head screwdriver
(I marked them in the picture in case you get confused)
Step 1: Cut Loose and Unwind
2. Take the screwdriver and unscrew the two screws found on the belt buckle.
3. Click next step.
Step 2: Position and Screw...
2. Put the screws back into the buckle and tighten them. They'll cut the new holes into the belt.
3. Put the belt on and give yourself a pat on the back. You just saved some money.