Train the valiant grape vine by eliminating any weak shoots. Immediately prune off any secondary shoots or suckers growing from the base of the main cane of your vines. These suckers can "suck" energy from the plant, and won't necessarily add healthy foliage or fruit to your harvest.
Prune the body of the vine. Grape vines should be trained to a trellis system of stakes and wire for successful growing. Remove any shoots that are growing down between the wires, to encourage the healthy vines growing along the wires. Cut the shoots at their base, near the main stem. Be careful not to damage the main stem while you're pruning.
Clean up your grape vines in the fall by pruning away any dead, damaged or weak foliage. This will allow the vine to put all its energy into maintaining the healthy vines over the winter. Never cut the main stems or canes, as this will damage your valiant grapes.