Pilgrim, that's really funny./w3tcompact/icons/laugh.gif
One thing I haven't seen mentioned is make sure you get an opener that is sized for your door. I bought a Genie at HD and found out that it wouldn't work for a 8' door, only a 7' door, despite the "Oh sure" from the helpful orange-coated guy. I only found this out after installing the whole thing. Not only that, but the screw drive had too high of a profile, and would not fit between the door and the ceiling when the door was raised. Disassembling the whole works was rather disheartening.
I called a garage door guy that afternoon who did a fantastic job installing a chain-drive model, with an extra cost over what I would have spent of less than $100. That was including wiring those little laser beams through the attic, etc. In your case, it might even be less.
I won't ever install a garage door opener again, if I can help it.
There, did that help?