I followed that tutorial many many months ago.... I suggest stocking up on brushes, and trying it again. Then, you can move on to another, higher level tutorial. Repeat that process untill you can make sigs on your own. That'll take like.... a month maybe.
Yesh, the font doesn't work so well. I would suggest finding another font, your sticking to like 2 fonts all the time. Next, try blending it in more, and adding more effects. It's pretty simple, but your following tuts, so your getting better.