I'm definitely not one for DIY but I'm quite happy with how these turned out.
I love these sneakers, I've had them for a few years now and they went all over the US with me. They're so comfortable (I can't walk for very long in any shoes without my feet killing - I can last much longer in these than anything else!) and are that perfect amount of worn. Now they have a bit more character!
The studding was really easy to do, the studs all have 4 prongs on the back that push easily through the canvas fabric. I used a butter knife to push down the prongs on the inside of the shoe. I'll have to wear socks with these (folded down really low since they're quite low cut), because the prongs on the inside will scratch the skin.
I've still got heaps of studs left, and I've been searching through my wardrobe to find something else to stud (a white tee perhaps?). It's so addictive!