I was told red is one of the most "different" colour to make, something about a totally different pigment or something, and easy to fade, or something like that :/ Didn't know it costs more.
The paint itself ain't expensive, 500ml is approx $40, colour matched PPG.
If you really do decide to paint it yourself, prepare to spend 80% of the time preparing.
For my 2 sideskirts it was 2.5hrs sanding, 15mins masking, 3min primer, 1min for each coat x <insert number of coats>, and another 1.5hrs wet sanding, then 30mins - 1.5hrs of polishing, depending on how shiney you want it.
Give it to a pro if you don't want to DIY, but the quotes above is a good ballpark.