Computer Tech Savvy?

I've been trying to change my blog template. I don't like how narrow the text is on this template. After an hour and a half of frustrations and feeling like throwing the computer through the window, I decided to stop and return it to it's old template. Any suggestions? I tried using a new template and it totally messed up my background and put "the cutest blog on the block" logos all over the place. Has anyone had the same problems? Help!!!