Re: How many colors on your palette?
I only use permanent, single pigment paints, and have 3 palettes. One is the small Winsor Newton Field Kit, with 13 colors; with that I also carry a "supplemental palette," 8 half-pans and 4 pans in a small clear plastic case, for a grand total of 25 in my "Everywhere Art Kit". My studio palette, with a total of 29 pans and half-pans, duplicates these 25, but adds 4 half-pans I very rarely use.
I like that tool to choose paints (above)!
Audacity allows you to be at ease with your inadequacy, safe in the knowledge that while things may not be perfect, they are at least under way.