I just flushed today for my second time ever. The only thing other forgot is that if you feed your plant after you flush use only a 1/4-1/2 concentraion of nutes. The do this right after I am done with my flushing I just water with my feed right after since they are soggy anyways. Last time I messed up my calculations and feed with full strength and they burnt a little then didn't relize it till after the next watering when I looked back in me log, so I didn't even flush it in time. I'm lucky though I have very understanding plants with very minor burn.

They will look a little droopy afterwards but they'll perk up.