Warm spells we have throughout the early winter are NOT good times to prune fruiting plants, such as grape vines, peaches, apples, and blueberries.  Pruning too early can create a situation where the plant is damaged by the extreme cold we might have in January or February.  Some plants, especially European bunch grape varieties, may have already received enough cold weather to meet their chilling requirements (hours of temperatures below 40 degrees needed to break winter dormancy and trigger new growth).  If this has happened the buds will begin to swell.  This bud swelling usually happens first to the buds closest to the tips of the branches.  These can be easily pruned off later.

Wait to pruning until February or March when we are less likely to have huge swings in temperature that will damage flower buds that have come out of dormancy.

Here are some links to videos that might be helpful.