like fekin said you only learn basics on a 4 day course i cant see anyone after doing a 4 day course going self employed straightaway the best courses are the 32 week
nvq course like don valley did or at least a 4 week courses
u need more experience if ur going to tackle bigger jobs. my dad tried a 4 day course he only did splashbacks and would never be confiendent enough to go self emloyed