I really can’t see how big the job isDo you think using a Skid is over kill on a project this size? One of the big benefits was getting some more experience with that sort of equipment.
In reality, a brush hog (previously suggested) or even string strimmers, hedge trimmers, and chain saw for the small "trees" (or loppers I suppose) would probably be fine.
If they want bare dirt
String trimmers and brush hogs will not do that