Don't worry about skimming anything. Some people boil the honey/water mix prior to adding it to the carboy. This creates a film that they then skim off the top, before adding the mix to the carboy.
However, having said that, don't boil honey ever.
Timing wise you should be fine adding nutrient now or up to the 1/3 sugar break I believe, but I will let someone more experienced and wiser to add their more informed advice.
Meads: Hababero and Sarrano Capiscumel, Show Mead possibly getting split and flavored, and 12 gallons of Bochet Deliciousness
Ciders:3 Ciders with differing additives TBD, Strawberry/Apple Cider
Wine: Black Cherry Vanilla Port