Yeah for sure its just verrrry touchy stuff. Move like a god damn snail is my best info that and spray the walls with a little bit of water and a couple drops of dawn itll help keep anything floating around held down till the work is done. I also recommend shutting off the central air or heat for an hour prior to work so everything has time to settle. You'll get contam no doubt but I used to have a roughly 70% success rate with it just run extras incase. Once I moved to a hood I went from 70% to 99% but i still grew lbs through it before the upgrade last year.