I put six plugs in my 1995 Camry. Three front were not difficult and three back difficult but just had to disconnect some parts nothing major. About 3 hours.

Asked dealer how much to install on 2007 Avalon V6 with plugs. One was almost $700 and another $550. The plugs from one dealer were $26 each and the other $16. A dealer online was at $12.00 Crazy differences.

I looked on how to do it and does not seem too bad on rear but will need to remove plastic manifold and some other parts.

Just wanted to share these outrageous prices. At least one dealer was somewhat in line. I have not looked at regular repair shops. Probably half.