Will this bolt directly into my truck without any modification?

Yes. This assembly uses factory mounting points — no drilling or modification needed. Bolts in the same way the OEM unit does.

Does the bulb come installed, or do I need to source it separately?

The bulb is not included with this assembly. You'll need to transfer your existing bulb or pick up a replacement that matches your truck's specification.

Can I install this myself with basic hand tools?

Yes. You'll need a socket set and screwdrivers to remove the old unit and bolt in the new one. Expect 30–45 minutes per side if you're working on both headlights.