Ok so this is interesting on the cost difference between having someone else do it vs. doing it yourself. Duncan, how much are the materials - masking stuff, bondo, sand paper, primer, paint, clear coat, etc?
When I asked my friend for the spray gun he said to me, "sure, but I've also got a guy that will do the whole thing for really cheap"....
Have the guy do it. You're going to spend 150 dollars on material between sand paper, primer, glazing putty, etc.....
And it'll be more if you screw it up. Bumpers aren't the best thing to attempt as a first paint job.
Also, I think your car has single stage paint.