I'm building a shed and will be using concrete blocks as my piers. My question is what is the easiest way to make sure all the blocks are level with one another (I know using a level and string line) but I'm assuming in order to have all my piers level with one another each footing will be different in thickness?The area I will be building my shed is on a slight slope. I'll be digging footers for the blocks, I just don't want to end up having to shim each pier if I can help it. Any help will be appreciated. Thanks