Seriously, because alignment is a safety issue, I'd do it as soon as possible. It affects steering, tracking and control. That said, you can rough it in with simple tools (like a tape measure and a good level) yourself pretty close if you know what you are doing, and get by for a few miles.
Personally, I did the tape measure thing to get the toe close, put the old tires/wheels on the front and drove to the tire/alignment shop. I didn't want to risk eating up those new tires on the 5 mile ride!