You don't need a "shop". All you need is a sheet of sandpaper, a piece of glass, or any flat surface like dry wall or masonite.
Lay the sandpaper, something like 200 grit, face up on the flat surface then swipe the cylinder head across it several times. You'll quickly see if there are any high or low areas on the gasket sealing surface of the head. I always recommend that you 'paint' that surface with a Magic Marrker, or machinist dye before sanding. That will give you a good indication of any imprefections after a couple of light swipes across the sandpaper.
If you see no indication that the surface isn't flat then simply install the head using the torque values given above. If you do see high and low areas, which is common, keep sanding as you rotate the head in your hand making circular motions as if you're applying wax to a car until the surface is uniform. You do want to be careful and not sand an angle into the head which is why you rotate the head as you sand. Go slow, don't apply too much pressure and you'll finish with a 'lapped' gasket surface that is better than what the factory provided.
This same method can be used to get a good gasket seal on the intake and exhaust manifold flanges.
Good luck.
Tom