Clearing land is a shit ton of work. I had a taste of it on a 5 acre unimproved lot which wife and I owned outside of New Cuyama, CA. I attacked it with a chainsaw for about a week or two with pitifully scant results. Neighbor rancher with 10,000 acres and cattle swings by, takes pity and tells me he rented a Cat D8 bulldozer for some work on his land, and he could let us hire the worker and machine for an hour if we wanted. We did, and in that hour the guy did more work than I could ever do. He dropped the blade and pushed, and nothing would stop that beast. That experience completely changed my understanding of what heavy machinery is capable of doing. Cleared the whole lot minus some more mature trees in 45 minutes. Allowed us to then focus on getting actual stuff done. That is key. The amount of work it saved us in those 45 minutes was incredible.