When did you install the car seat?

When did you install the base for your infant car seat? I'm currently 33 weeks with baby #2 and anxious about getting everything ready. My son starts kindergarten right after I'm due (due date is August 29th, first day of school is September 10th) so I want to get as much done as I can before I get too close to my due date because it will be such a busy time for us. Is it too early to get the car seat installed? Also any advice for someone in my situation with a child starting school and adding a new baby to the family would be great. Thanks!