When and how to properly prune back grapes in mid-Missouri

Hughesville, MO(Zone 5a)

Our vines are a tangled mess again and I need to know when and how to prune them back to a more manageble length. These are about 10-12 year old plants and have been severly pruned once about 3-4 years ago. That cost us the next year's crop so I don't want to repeat that mistake if I can avoid it. Or do you have to do that every few years to keep them under control?

I would also like to know what to use for fetilizer(either organic or commercial)to get the best production.

Castelnau RB Pyrenée, France(Zone 8a)

The vintners around here prune their vines back to the trunk EVERY year leaflady. I need to find out more about this subject myself, so will read up and let you know.
You seem to be in quite a winter cold zone for grapes - they obviously don't mind :)

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