When I was thirteen when Moses was alive. I changed my strings. I am like Schmange's guy in the trunk.. I do most things myself first and since you learn by your mistakes I must be one of the smartest people around cause I make a lot mistakes. Just ask my wife, she will gladly tell you... The mistake I made with changing my strings is that I didn't know how to tune a guitar.. So I tighted the garbage out of them. (It was a cheep accoustic). Well it was so tight it ripped the bridge out to a 35% angle. And also made two nice holes in the guitar. I didn't get upset, Why? cause "I"could fix it. So I got two bolts and used jar covers for washers on the inside of the guitar. The next Day I went to my first guitar lesson. Till this day any time you hear someone laugh and you don't know what for or who it is. It is my Guitar teacher. So just one important thing DON"T OVER TIGHTEN THE STRINGS. Use a Tuner!!!!!