Does this bolt straight onto my door without any prep work?

It uses factory mounting points—no drilling needed. You'll need to remove the old handle and test-fit the new one to confirm alignment before final installation.

Do I need to buy hardware separately?

Hardware is not confirmed to be included. Have fasteners and any clips on hand before you start, or pull them from your old handle if they're reusable.

Will this work if I still use the mechanical key lock on the passenger door?

This is a no-keyhole handle—it's designed for keyless entry vehicles or doors where you don't need the lock cylinder. If you need to operate a mechanical lock on this door, order the handle with keyhole instead.