I let my girlfriend take my 3 out for a spin, and she ended up backing up into a car.

There is a scrape roughly 3 cm in diameter exposing plastic and metal on my rear bumper/body panel.

She has agreed to pay for the repairs (even though I will be helping her out). I got it quoted at two local body shops, it will cost $550 to repair.

How feasible would it be to complete the repair myself?

What steps would be involved and what would I need to fix the scratch/scrape?

I apologize if this is the wrong forum section.