My kid has a 2006 Solara SLE convertible that had an original JBL radio with a nice tape deck and CD changer. He wanted bluetooth, but we also added CarPlay and a backup camera.

This video walks through the materials and step-by-step process of removing the dash and old radio then adding a new Boss BE62CP radio with a much-needed backup camera.
I describe my Crutchfield Ready Harness that keeps the steering wheel and Fade and Balance controls, compare the 2 available Solara Double DIN trim kits, wire a DIYBypass, and add a new USB port for wired Apple CarPlay.

NOTE: I am not a Youtube pro, so any camera work will have to be tolerated.

Materials in this video:
Crutchfield BE62CP-C Radio plus camera kit
Crutchfield Ready Harness Service, including:
Metra TYTO-01 Harness (Keeps Fade and Balance)
ASWC-1 Steering Wheel controls
Metra 70-8114 (simple plug-in Steering Wheel controls)
Metra 99-8212 vs. Scosche TA2087B Trim Kits
PAC - 6' USB Extension Cable with Dash Mount
DIYBypass