Last time, we had the carseats installed about a month before my edd. Make sure you take it to get checked by a certified carseat tech. You can usually find them at your local health dept or by calling your local police dept and asking them. What we did was just bring our cars (we had one seat per car, since we skipped the infant carrier and got the convertible seats) and the seats with us to meet the lady at the health dept and she showed us and then helped us install the carseats on our own. It's the best way to learn how to do it correctly since there is some crazy percentage, like 90% of carseats are incorrectly installed. I think having LATCH has helped decrease that %, but even LATCH has been having a few issues lately, so it is always good to know how to install the seats correctly the, "old fashioned" way too. GL!