Well the head unit is easy to do yourself. It will usually cost about an hour worth of labour which can range from $65+. I would definitely do the head unit yourself. Just go to auto1, autobarn or supercheap and get a Aeropro toyota harness adapter. Then it is pretty much a plug and play. To take the facia around the head unit off; 1. Take the ashtray, ciggy plug out 2. Using the ciggy plug hole, and the ash tray hole, you now have something to hold on and just pull it straight out. It may take a little bit of force but the bottom 2 clips will pop out. Then using the middle part of the facia that you have just loosened, pull that part outwards and it will pop out the top 2 clips. Unplug the ciggy lighter. 3. Undo the 4 screws holding the headunit in place. 4. Using your harness you just bought, you plug it into the stock harness, and then into the kenwood harness. 5. Then swap the headunits out and put everything back into place If you are doing it the first time, it may take an hour to an hour an a half. If you have done something similar in other cars or if you are familiar then it'll take like 30mins max. And I thought all the Vienta came with central locking. As a matter of fact every single model of the camry had central locking. What happened to it?