hi groombride, my HB drove the wedding car himself too.. yes, it's much tiring, but it's more intimate i feel.. after my brother open the door for him, one of his XD will drive the car to park at the loading & unloading bay.. they didn't park at the carpark..
i also heard abt the car head thingy.. we also do that too, cos my MIL instructed us to do so.. just follow lor.. i also dunno why..
although ours is not open-top car, my friend had one for her wedding, her HB drove himself too.. my advise is to inform ur MUA about it.. she will know how to handle ur hair.. put more hair spray..