1. You do
NOT need to remove the door panel..
2. It is a 5 minute job to remove and replace. Pop of the cover on the inside of the door, 3 bolts, unhook wiring connector and revers.
3. You can buy just the mirror, but you need an assembly.
4. You need to know the following when ordering: Heated or non-heated, make sure it is for a US built Camry, right paint code (if you order a painted one).
5. Part number for a US built, unheated one with 1D4 paint code is 87910-06190-B0.........Heated with same specs is 87910-06200-B0.
6. The 1st part number is $117.02 + shipping and the 2nd is $137.45 + shipping from a discount Toyota parts dealer,
http://toyotapartspeople.com/