First you’ll need to cut two circles from cardboard (the bigger the circle the fatter the pom pom). Then cover then in tape (packing, duct tape, what ever you have) this will make it so you’ll be able to reuse your circles and give them a bit more durability when you’re cutting between them. Here is a closer look (as you can see they don’t need to be perfect).
The next important step is to make a 3 footish long strand of yarn and double it over so there is about 15 strands (bulky yarn will need less).
Put the circles one on top of the other, and wrap your 15ish strand of yarn around (looping in through the hole) This will only take about 10 wraps. You’ll wrap one layer, and the next will lay beside the previous one until the cardboard is no longer visible. The smaller the hole in the centre when you’re done the tighter the pom pom will be.
You’ll have the ends of your doubled yarn sticking out the side, but don’t worry you’ll be trimming that off!
Now grab your scissors. Holding your wrapped yarn circles on its side poke the scissors between the two layers of cardboard and cut in a circle.
Take a 1′ strand of yarn (I like to double mine), lay between the two layers of cardboard and tie in a knot or two.
Pull the cardboard off each side.
Give a little trim so all the strands are the same length.