Never made wine from fresh pears but due to flavor profile Id try to not dilute t with any water. Id probably core them and maybe get a new garbage disposal (Sink Monster) and mount it on a pce of plywood with a bucket underneath it unless you have an apple crusher. Not sure also if pears have a high malic acid amount like apples but if so Id probably use Lalvin 71B if so to eat up some of that malic acid. I have made a pear wine before using canned pears and I should have used more pears but even with that said it tasted like a very nice Chablis.
I have tasted several pear wines... it is very delicate. NO WATER. You can also core them, throw in a bucket with just a bit of Kmeta water and cover it. The gas will keep them from browning. Next FREEZE them. Once they come out of the freezer, a light mash will get them ready. Double the pectic enzyme and you'll be off to the races.