stink is right, do it before you start flowering, tho as it is early and there is a different between starting 12/12 and once the plant actually begins to flower you could maybe get away with a repot, do it carefully, have to new pots ready with soil in em and do it quick and carefully ..
about trimming, also do this before flowering and don't remove fan leaf`s unless they touch the soil or are close to, if you want to remove anything remove them low bud sites (lolipoping) that as you said, only produce popcorn buds (or do like me and make oil on em along with the sugar leaf`s)
I actualy had a rootbound plant in flowering (+2 weeks in)
this was my solution
8 weeks Veg in 7 gallon pot`s and still it got root bound, to avoid any stress on the plant in flowering I just cut the bottom out of the 7 gallon and sat it in a 5 gallon with 2/3 soil in it ..