30 minutes per day will make you an “airbrush control freak” in one year.
That is all that it would take. Nothing takes the place of consistent practice, By practicing a small amount of time every day for one year, you will create muscle memory and your airbrush control will happen naturally.
If you set your practice schedule as immovable blocks of minutes, you will be able to reach this seemingly lofty goal of practicing every day. I make sure that I do my paintings in airbrush during the one hour in the morning before the phones will ring.
I learned more about controlling my airbrush through the act of practicing than any lesson or seminar could ever.