Do these bolt directly to my bumper, or do I need to modify anything?

These mount at factory rocker points with no drilling or cutting required. The bezels sit flush in the stock fog light openings on SE and XSE models.

What about the switch—does it come wired and ready to plug in?

The switch and harness are included and ready to connect. You'll run the harness through your bumper and up behind the dashboard to the switch location—standard single-wire install for most vehicles.

Can I use these if I already have factory fog lights?

These are replacement assemblies designed for the factory fog light cavity. If your Camry came without fogs, you'll need to verify the opening is present before ordering. If you have working factory units, these are a straight swap-in upgrade.