This weekend I am working on Snoopy's doghouse and have to get my edges straight and my top level.  I have read that other users went to Home Depot and bought a laser leveller....any hints on which brand you use and how you use it would be greatly appreciated....Thanks!

I did the exact same thing thinking it would work. It didn't. I had gotten the small iLevel cross level by Skil to use for cakes. I was thinking it would be a laser beam that I would see go across the top of my cake instead it just bounced off the wall. I even had a piece of poster board up behind my cake that the laser light reflected on. Trying to work it was too much to deal with the poster board setup. It was also too difficult to position the leveler where needed in order to level any side of the cake. In the end it was returned and I learned to just shave off the top of the cake where its not level and smooth ice it. For the sides I now use a scraper and a right triangle.