It all depends on what type of finish you are after and how far you want to go.
Do you want a quick blow-over where they mask up the lights & windows and then spay the outer panels so when you open a door or the bonnet the old colour jumps out at you or do you want to go the other way where you get 100% coverage so you can't see a trace of the old colour?
When I was rebuilding my 90 I replaced every panel (bonnet, wings, front-panel, bulkhead, doors, tunnel, seat-box, rear tub, cappings, tailgate, windscreen-frame, spats etc) for either new or new/take-off items so I had a mixture of bare metal, primer & factory finish paint. I took all the panels down to the spray-shop and had every surface of every panel painted so that when it went together only the correct colour was seen.
The result was excelent but it was a lot of work and I think the spray-shop realised they had quoted too low (ever seen a completely dismantled LR?).