It's quite simple, really. You just cut away everything that doesn't look like what you want (writing as one who can't draw a straight line with a ruler on both sides of the pencil.)
You get a template, use a small awl to poke holes in the pumpkin along the lines on the paper, then use one of those pumpkin-carving sets with the little knife and cut along between the holes. I actually did it one year and I'm legally blind. It's do-able!
Okay, I didn't do anything like THAT stuff on the website!