Without a live pto you need to learn to pop the transmission out of gear smoothly so that the clutch and thus the pto keeps turning, it takes a little practice, but when the baler plunger changes direction it unloads the transmission momentarily and you can pop it out of gear until the baler works the hay through, best learned on smooth flat ground. The B should be fine power wise in most situations, As a kid I made a LOT of bales with a 14T pulled by an unstyled all fuel AR, while pulling a 10 bale manual stooker in pretty hilly country. If you have access to a live pto tractor you might want to use that to learn the baler's "personality" first, then whhen you are comfortable switch to the B.