We got ours installed professionally too and we only had the one car that could accommodate the kids (up until two weeks ago, other car was a hiace).

We had to get mum to come and babysit. I'd drive the car to the mechanic, DH would pick me up and bring me home and then we'd repeat the same painful process when the car was ready. Absolute pain in the neck.

It was a big factor when we made the decision to replace DH's van with a dual cab ute instead of buying another van.

DH isn't interested in sorting out the car seats as far as taking them in and out of the car. Any adjustments that have been made in the 4 1/2 years we've had them have all been done by the same car seat fitter.