My suggestion would be to juice the pears and only use the juice for your wine.. the flavour will be better.. or make a pear cider.
also note that pears have natural unfermentable sorbates in them.. so it will end up with a sweeter natural finish.
Pear cider is just juice, citric acid, pectin, campden and a cider yeast pitched 12 to 24 hours later, you can adjust the sugar if you like, I just leave the juice natural and get a low alc in preference.
pear wine is the same.. just use a wine yeast and sugar to 1.085 SG
tannin is a personal preference.. if you choose to add it.. it's a cup of strong black tea per gallon of must.
Allie