Only tip I can suggest besides the usual big brush, thin coats is to paint each coat in one direction, let it dry completely then paint the next coat in perpendicular to the last. Basically if you paint to the left for one coat paint up for the next, then right for the next than down for the next, repeat. Dry layers help to make sure the paint levels correctly and perpendicular layers minimize brush strokes.
If you're paint more than couple please just save up for an airbrush. Even a cheap one just to do base coats. You'll hate yourself less.
The Master series is great to start with (basically clones of brand brushes decent reviews)
http://www.tcpglobal.com/airbrushdepot/abdbrand.aspx
Or even look into colored primers and spray paints.