There's nothing particularly onerous about it, it's just that 6000 MP3's is going to take a while to upload and organize.
Probably the best advice I could offer is to take your time. There is no earthly reason that you have to have all 6,000 of those songs installed into your RioCar the first week you have it.
Do it one or three or maybe five CDs at a time, and spend what seems to be a ridiculous amount of time getting your tag information exactly, perfectly right -- all the words spelled correctly, capitalization and punctuation properly done, and as much information as you can possibly extract from the liner notes and still fit into the tag format. It will seem like a lot of work -- but you will be very grateful in the future that you did it right.
tanstaafl.
_________________________
"There Ain't No Such Thing As A Free Lunch"