I'm sure it can be a DIY job for you, just make sure you fully clean the plastic parts to be painted of any residues, wax, silicon etc using thinners or specific cleaner, also make sure you have proper 'plastic' primer as this will stop the paint from flaking off. I'm sure Halfrauds or similar will have the right stuff.
If in any doubt, I would pop along to a local bodyshop or the like and see what they can do to help (for a cash incentive) as they will have all the kit, even if it is just preparing ready for you to paint the colour of your choice.
Hth
Sent from my iPod device using Tapatalk