<font color=blue>My first job is fixing a buddies yard</font color=blue>
Hope he's a patient buddy.
Actually, it sounds like an excellent project to begin the box blade learning process on. It's a seemingly simple tool to use, but it takes lots and lots o' practice to start getting the results you're looking for. Don't ask how I know.
What kind of shape is the existing landscape in? If it's relatively flat to begin with, you should probably do fine. But if it has peaks and valleys and it is at all hard packed, you've got your work cut out for you. As others have already mentioned, the height of the blade will vary as the tractor itself climbs and drops over uneven surfaces. There are times when you'll do better, at least on the first pass, by using the FEL. Any time you can keep the tractor on the already-graded surface, the better chance you have of bringing the rest of it into line.
Will your box blade have rippers? Often times you'll need to break up the high spots before you can begin the leveling process. That's when rippers (scarifiers) or a toothbar come in handy.
Once you have the general terrain the way you want it, spreading the new black dirt should go fairly smoothly. Might be a tedious part of the learning curve, getting a feel for the angle and height of the blade just right, but if you take it slow enough you'll have hours of therapeutic seat time.
Oh -- and you'll find that these things are much more satisfying if you take lots and lots of pictures to share with your TBN buddies. /w3tcompact/icons/grin.gif