Another video tutorial on digging and dividing a hosta. This technique is a bit different in that it suggests removing as much soil as possible as well as cutting off foliage, while others have shown trying to keep as much soil intact as possible. Jury is out on which works better.
Winter: Prune long shoots down to three or five buds. Before pruning: In winter, the vine’s framework is again unruly, but it is more exposed and easier to prune now than in summer because the leaves have been shed. Pruning and Training Wisteria | Fine Gardening