to answer all these in one..

the best thing to say is to try it in a vacant area and make sure you dont go in front of people, by the looks of your questions , you might get paranoid... lol
but red eyes are fun, the more you cough i feel your eyes get more watery but eventually dry out due to not blinking......
get some visine or rohtos eye drops...
if you want gather your stems for a good couple weeks"even longer if you dont smoke much" then find a grinder with a kif catcher then grind it all up and you got some kif
best way to use stems"Get an ounce bag full of stems or more