Hi there, and welcome to Illinois!
Just like any DMV, I'd suggest that you visit early in the morning or mid-week - it's usually less crowded then. This ought to save you a lot of time from waiting in line. Speaking of, consider booking appointments online in advance, since I hear the Illinois DMV prioritizes those over walk-ins. And, remember to double-check that you've got all your paperwork in order!
Do let me know how it goes, and best of luck
