@cardboard33 We had never changed nappies either... Amazing how quickly you become an expert! Don't worry; you'll work it out. And the midwives are extremely good at giving advice when asked.
Regarding the multiple bags / no car situation - I would have one with all the essentials for a 2-day stay, and then keep an extra one packed at home for your husband to go and get if you have an extended stay.
Regarding the car seat... Yes, you might go through different rooms. You might even be in a waiting room at the start I think? (I was induced with DS and we were in a waiting room for ages, but I've heard that can happen even if you're in labour if the hospital is busy.) I think probably in your situation I would leave the car seat at home for your husband to collect later. An hour round trip isn't so bad that it would make me want to battle in with the car seat whilst in labour!
One more thing - can't remember if someone said it here a few months ago or if I've heard it elsewhere, but it is a REALLY good idea to keep baby's first outfit - vest, sleepsuit, hat - in a ziplock bag so it's easy to locate / grab. With DS I ended up having an emergency C-section and all of our bags were moved to a different room while I was in the operating theatre. It was all such an emergency that grabbing a baby outfit was the furthest thing from DH's mind, and the result was that DS was in a hospital blanket and hat for hours. I seem to remember us getting criticised by a member of hospital staff about this as well, but I may have got the wrong end of the stick.
Also, if you're planning on doing any breastfeeding, do make sure you take in nipple cream. Lansinoh was a god-send with DS. Expensive but worth it.