DIY paint booth fan question

what would be good info here is idea's and ways for the at home novice or small shop that only paint a few cars over a couple decades can safely do it!! seems ventilation would be the first concern after respirator an paint suit. and with ventilation the fumes need to be filtered out some how for environmental concern, whats a redneck to do? how dose one pull this off on a limited budget??? inquiring minds need to know!! teach,...dont just preach!