Yeast nutrient is used in meads because there are no real nutrients in honey. Malt and grape juice have more than enough nutrients.
Better out of the fermenter than in the beer, I always say The scent will go away, and you'll be left with amazing beer.
If you are not growing your own 6th generation barley and hops, you're not *really* homebrewing.
Fermenting: Real Ale, Extract Lager (with WLP830), India Pale Ale
Drinking: Pale Ale from the keg