I am still learning the "art" of playfield restoration and thanks to Gavin and Tim, I'm totally immersed and it has opened many new doors for me. The key to playfield restoration is PRACTICE and using the right paint and equipment for the job.
Tim pointed me to "Jo Sonja" paints. Available at art stores or Bunnings. They are acrylics. I won't use enamels on a playfield as your Dad pointed out - too messy. With acrylics, you simply wipe off with a damp cloth and start again.
As BOOTS kindly pointed out, that restore is "real time" and look when I started it - It has taken me months to learn how to paint properly, and I am still making mistakes.
There's PLENTY of references on this site. Tim's Funhouse, Gavin's Jacks Open and Bank a Ball. The MORE time you spend learning and researching, the less time you spend repeating your mistakes - and you will make mistakes.
Ask questions - I found all the info I needed from the guys here. There's no harm in "having a crack" - you just need the encouragement.
Colors ? I've bought 20 Jo Sonja paints and I experiment. 75 ml paints are $4 at Bunnings.