Since you don't plow regularly try low range or a low gear to see how it goes. You'll have more control, though you won't go as fast. You can always change to a higher gear as you hit the flats or plow some going uphill. You might want to drive some stakes along the edge of the road where the tractor is most likely to get stuck to keep yourself and tractor out of the ditch. This job is best done with seatbelt on and ROPS up on the off chance you layover in the ditch. Hopefully not, of course, but snow can be slick as snot, and without chains things can go from bad to worse real fast.
A plow has the advantage of keeping the wheels out of the ditch more then a FEL due to the plow being able to extend and angle away from the FEL frame/wheels while pushing snow. So be careful to not get your tires near the edge of the road/ditch.
Remember your objective is to clear most of the road, it's not like mowing a golf course in summer! Close is better then nothing and you can always go back and do some cleanup later. Keep the BB on for balast especially if your rears aren't loaded.