yeah about the plugs, I've never found a need to change them after. if you were going to change them then obviously do it before, but otherwise just go ahead.
suck the bottle in, run for a minute, shut it off, wait 5 minutes, then start back up and rev it slightly for a few minutes, then run til smoke clears. you get a smoke show and itll clear up. any rough idle thanks to clogging the plugs will go away when you punch it down the street.
heres a vid of me doing it on my S4 (sorry about the upside down)