I hayed 7 acres with a geared 25hp Ford 1700 for years in the 1990s. I had a Taarup four disk mower (don't even consider a sicklebar), a generic PTO-powered side delivery rake, and a Massey Ferguson [small] square baler. The only problem I had was when a windrow got a bit heavy. Unfortunately, those old Ford CUTs did not have a live PTO. Without a two-stage clutch I had to shift down from midrange-first to low-range-3rd slowing the ground speed to keep the baler from picking up so much it would jam. I got real fast at clutching, moving two shift levers real fast (almost simultaneously), keeping the flywheel on the baler going, and not grinding gears (much). Should be much easier with a hydrostatic transmission. It's not as fast as using a big tractor; plan on designating a week of long days to get it done, and a few nights worrying about whether it's going to rain.