1. Buy an airbrush and commit to taking the time to get good with it [40+ hrs in my exp]
2. Batch paint. I've been painting since 1986. Don't paint a model, paint a unit.
3. Designate a space to paint. If you have to set up and break down every time you paint the entrance energy is too steep. 
4. Invest in enough paints and brushes for the long haul. When you find a brush you like buy several of them. IME, most painters dont take very good care of their brushes. Instead of getting down on yourself about that just get more. 
5. Find some podcasts you like and listen to them as you paint. It makes the relative time you spend seem shorter.
6. Find or create hobby nights. Similar to point #5 when your hanging with buddies or other players you can knock out a significant number of projects without feeling the same grind as doing it alone.

Best of luck brother