Go for it! It's pretty time consuming but it's fun. Once I found the picture I wanted to paint, I printed it out with a grid over it. Then I cut out a bunch of string and taped it to the wall to make a larger grid (you could also just draw the grid on the wall, either way). It's a lot easier to get the proportions right if you use a grid and just draw one box at a time. After that it's just a matter of finding the right colors and painting it in.