[billybek]

The trouble with hanging vertically is that the edges don't always match up with the studs. If the studs are out of square adds another problem with the vertical install.

Buy a decent drywall square. I did my garage first and then the main floor renos and then the basement developement. The horizontal hang is much easier.
Ceilings are a pain but they are do able on your own even without a lift. I used a lift in the garage and the main floor of the house. In the basement I made some wall cleats to support the drywall on the edges then made a prop to hold the other end up. Worked pretty well if you are not in a hurry.

I measured and pre cut all the boxes. This is pretty easy once you get the hang of it. I had learned from a drywall taper friend of mine and he would tease me that the one board I took 5-10 minutes to measure and cut prior to hanging would have earned me a buck fifty working in that field. While I would always hang the board, I would always pay cash to have one of his tapers come in to mud and sand. In my mind, well worth the money and the result is a professional finish. Not a big deal in the garage though...