I have a concord grape vine that is about 24 years old. When my husband and I planted it we had no idea what we were doing. We planted it between two posts with woven wire and let it go. I believe it may have been pruned back a few times but not like it should have been. I realize now that the two shoots that are about 6 inches from the ground should have been cut off when they first appeared. So my question is, how do I prune this vine? Can the two bottom branches be cut off without killing the vine? If so, what do I need to do or do I need to put anything on it to seal the trunk. My next question is, if I cut off the grapes before all have turned will they still ripen?