Excellent post. Safety first especially for the baby.
On that same note , check into your local PD for car seat proper mounting guidelines for safety. A lot of police departments will have a booth set up at a local health fair promoting proper child seat mounting in YOUR vehicle.
Apparently this is more difficult than you would think , police depts report that over 80% of the child seats they see at one of these events are installed incorrectly.
Also a good point. I know locally both our police and fire departments will inspect your car seats for you to make sure they're properly installed anytime. We had ours checked at a fair like you mentioned and heard these same statistics that most don't properly install their carseats (thankfully we had everything done right). That's another reason I feel the "base" systems are nice because you can install the base once and pretty much leave it alone, whereas a carseat you need to make sure you install it correctly each time. From what I understand there are a number of things people typically do wrong like:
1. Not tightening up the base/seat enough. You should be pushing/kneeling on the base to compress it into the car's seat as much as possible and tightening the belt/anchors really tight. This avoids any slop/movement and whiplash in case of an accident. Honestly this is where it matters who installs it because I know my wife is pretty strong, but she can't get this as secure and tight as I can.
2. It's also recommended to have something underneath the base/seat to keep the base/seat from slipping on the car's seat. I mentioned that Kiddopotamus DuoMat before, but you can also use very effectively an anti-slip matting that you find in a Target/Walmart which you'd normally see installed in kitchen drawers. This is especially important with leather seats as they can be more conducive to sliding than a cloth seat. The Kiddopotamus product will help protect your seat too, whereas the matting just keeps it from slipping but you'll leave a nice indent in the seat
3. The correct angle on seats is also needed in case of accident. Most of these carseats have an indicator showing whether you're in the correct range of angle to provide the best protection.
One other note is make sure you get this installed correctly before going to the hosptial too. I don't know about where you're delivering but at our hospital they will come out and check your carseat to make sure it's safe and secure before allowing you to leave after delivery when being discharged.