I know how much effort I have expended to clear 50'x50' patches of thick scrubby forest, and I think the goats could do it more efficiently (and happily) than I could.
I could set up 200' of panel fencing fairly easily, but I also have coyotes and bobcats so I doubt I could protect my goats effectively.
Sounds like a heavy skid steer with a mulcher will be more efficient but less enjoyable!
If I do get serious about the goats when we are moving out to the farm, then I will definitely open a new thread on PB for advice!