Do I need to remove the front bumper or grille to install this?

Installation procedure depends on your specific vehicle's headlight access. Check your service manual or test-fit before committing to disassembly.

Will this work if I only buy the left side?

This is a left-side unit only. If you want matching DRLs on both sides, you'll need to order the right side separately.

Does this come with wiring harness or plug-and-play connectors?

Only the light assembly is included. Verify your vehicle's existing connector type before purchase — you may need an adapter harness depending on your current setup.