Don't use mineral spirits to thin your paint it is ok to clean up with but I wouldn't mix it with any thing becuase it doesn't evaporate as well as lacquer thinner .and if you are using the lacquer paints you can go start to finish in an evening .Treehugger Dave has a wonderful tutorial on this subject if you follow his technique carefully they way he has it laid out you should have a top notch paint job in no time. good luck and keep at it also don't expect to be a pro your first time out ,finish what you start and correct problem areas on the next one .