If the area you're gonna level is actually 100' x 100', and you're going to actually level that area without making half of it "cut" and the other half "fill", (IOW, cut down the entire 100 x 100 and push the spoils out of the way) then you will be moving approximately 1,111 cubic YARDS of material.
How much time were you planning to spend on this?
Just for reference, I have an older Case backhoe, and a power down 3 point hitch add-on, with a Gannon 7 foot box scraper with hydraulic rippers - I did a "push-out" that's about 180 feet square about 8 years ago, did the math and I moved roughly 2400 yds of dirt in 4 12-hour days.
Difference is, my BB weighs almost as much as your tractor, and the tractor minus hoe weighs in at roughly 6000 pounds - I would lower the rippers, make a few side-hill passes, then start at the top, drive the bucket in and roll it out, level it and into float mode, then drop the BB and move a full bucket and full BB to the lower side, dump the bucket then pop the BB up as I went over the edge, drive back up to the top and repeat. Between the bucket and the BB, I was moving about 2 yards of material per pass.
I'll repeat the advice to keep your bucket as low as possible - and by the time you're done with this project I guarantee you'll know a LOT more about your gear than you do now.
Not trying to dissuade you, just a bit of perspective - as has already been said, there's no question that you can do this, only a question of how long it'll take... Steve