Turning the screw works for most people, including myself. If you do a search though, you'll find that finding the right idle on these motors is one of the most discussed topics on this forum.
Good luck,
Adam
edit: Definately disconnect the battery before you install the new TB. Make sure it stays disconnected for 15 minutes or so to clear out all the idle memory. When you start the car up, let it idle for a couple minutes for the computer to "relearn" the idle due to the new air flow. After it has idled for a few minutes, then adjust the screw while the car is running and tune that sucker like a carb. Thats what I did anyway.