How do you replace the headlight bulb located on a 2007 Hyundai i30?

You have to remove the light housing as it is too tight to access from the back.

This involves removing the 3 bolts securing it, (two on top, and one on the side)

Remove the power lead the goes into the housing (near the bottom).

It can be tricky to get out and in, but may be easier if you remove the front grill (assuming it's easier as I do it without removing the grill).