Buy good paint - the blue was expensive paint and it covered the white in just one coat (except for a few areas where I rushed). The red was cheap paint and I had to put on 4 or 5 coats before it really looked good.

If you get custom mixed colors, and you get more than one gallon - mix them together in a bigger bucket before you start. Our two gallons were just a shade off and we ended up having to put on another coat to fix it.

Buy good paint brushes - a friend made me buy a $15 brush ("But I can get 5 of these cheap ones for the same price!") - and let me tell you - a good brush makes the work go much faster.