Hi Ben and welcome to the site
The wings on a MK6 are bolt on mate so you will be able to change it quite easily.
The bumper is a clip on design but there are three Torx screws in front of each front wheel in the wheel arches that secure the wheel arch liners to the front bumper.
Remove these screws first, pop the bonnet and remove the grille then un clip the bumper at the top and the bottom and it will come off.
Remember to disconnect the fog lamps first (if fitted)
Any bumper from a 2002 on Fiesta will fit.
You can get spray paint from any major car paint dealer.
Just take my advice first before you do a DIY job -
Take the car to a bodyshop for a free quote on the repair to make sure that you have not damaged the chassis rails in the car.
A minor knock on the wing and bumper can still start the deforming process of the crash tubes on the chassis rails at the front of the car.
The crash tubes are also bolt on and easy to change once you have the bumper off.
Good luck