No idea on wine, it's not really a gardening question but at this time of year I completely relate to wanting to preserve crops. I'm stewing toms & looking to pickle the last of the little cucumbers. Maybe we need a recipes thread?
Membrillo recipes are worth a look for quince or pear growers with too much produce...

Pammie , I have been making wine for years . (Few people drink it ) There is a lot of suspicion about homemade wines , for some reason .
Anyway , if they taste sweet enough they are ready to be picked . Go online for a recipe , my old book used to say 3lbs of grapes , one gallon of boiled hot water , soak for 4-5days , strain ( I use a potato masher too ) , add 2lbs sugar , two of yeast powder , a bit of Marmite , and put in a Demijohn for six months . Put more grapes in if you have them . Cheers !

Darren we already have recipes, go to R in the A-Z, click on Recipes from the garden...

Thanks very much Lincs! I'd never noticed that

Darren you are welcome, many people don't check out the A-Z, its very informative, can save hours of browsing through blogs and questions..

Marmite?