Using water color pencils is not easy when you're not sure what you need to do. I should know. I've messed up a stamped image or two (or more) because I had no idea what I was doing.
Well In the April 2007 issue of Scrapbooks Etc. I found this great demonstration. Now, I'm one of those people that needs to SEE how something works to understand it. So, I really hope this helps you out!
If you can't read the print on the picture very well, just click on the picture for a much larger view.