help with a brush painting question!!

There was a really good article in FSM put out a few years back on brush painting.  I believe Jeff Herne wrote it.  IIRC, the basis for a good hand painted model is a good quality brush that is suited for the job at hand.  In other words, match the brush size to area or object to be painted.  Then prep the surface and only draw out enough paint for the painting session.  Lay on smooth coats and try not to brush over the same area twice to avoid brush strokes.  Don't forget to let the paint thoroughly dry between coats.  IMHO, if you really want to do it right, spend $100 on an airbrush and a small compressor.  A good quality entry level airbrush literally will last 20-30 years, trust me, I have my original Badger 200 and Paasche H.  Yes, I also own Iwata's, etc., but the Badger and Paashe brushes are still very, very good airbrushes.

I tried and tried, but for me, there is literally no way to brush large surfaces with a brush.

I would advise cheap airbrush for such painting. Or not so cheap, if you can spend $150 on airbrush and $100 on a compressor. But even cheap external mix single action airbrush will paint large surfaces better than brush.