+1 to the suggestion above to make a tea and try in a neutral beer first. A few years back I added fresh rosemary to a one gallon IPA kit. Would have to check my notes for amount used, but the rosemary was way too strong and my husband ended up using it in cooking short ribs, etc instead. I do think it could be a really nice ingredient though because of its piney flavor, but recommend experimenting with quantity to be sure you don't overdo it.