First time poster here.
I asked a family acquaintance who does some car repairs for us while not working in the garage to help me/teach me how to repair a variety of nicks, scratches, and gouges on a less than 1 year old Mazda 3. (My girlfriend is not very good at parking

). He was, in fact, painting my mother's 4 year old van when we were speaking. Looking at the car, he said he could not do it, even though I had already bought touch up paint and spray paint, primer and clearcoat, as well as 320, 600, and 1000 grit sandpaper in preperation for the lesson. He says that because the car is new, the results of any paint job not done with a paint gun would not be satisfactory, for a variety of reasons. He said he would help me sand it, but then I should take it to a garage and get a quote.
My question is whether this is necessary, or if he is just being cautious since he does not want to disappoint the owner of a shiny new car. I looked over the paint job he did on my mother's van, and to be honest, except when examined with the utmost scrutiny, the job looks pretty nice compared to the original paint.
Another question is, say I were to sand and paint a scratch, what's the best way to ensure the newly painted area blends with the surrounding area?
Lastly, one area of the bumper is particularly bad, and the paint is so gouged that you can see down to black plastic (the paint color is metallic grey). IIRC, it looks to be about 0.5mm deep. Do I need to fill this with something, and how can I get it looking brand spanking new?
Wow, thanks to anyone who is generous enough to give me some sound advice.
Cheers,
Times