I had fellow nestie/bumpie emiliemadison install baby #2's infant seat and move dd1's carseat and re-install it today and I have nothing but awesome things to say! I'm obviously huge so couldn't help much but she showed me every step of how to get them installed in case we need to move them or switch them between cars.
I would highly recommend getting your carseats professionally installed (or checked after you install it). Dh and I know how to do it but I feel so much better knowing someone that has been trained in it installed them correctly. Plus the carseats have to in so much tighter than I ever would have imagined so it was really nice watching her do it so I know exactly how tight to make them.
Her email is: emilie.cpst at gmail.com if you'd like more information or set up a appointment.