Do some of the takedown pruning as you have time. This means cutting to the ground the shrubs that benefit. It is notorious for scale, but it grows to 5 feet each year if cut to about 6 inches each year. If yours does not grow well, it may need more water. It can be cut to within 8 inches of the ground, or taller if you prefer.
Artemisia is a shrub-like perennial that is making new growth at the bottom.
Cut off the tops and divide the plant now. This is a real chore and may require a chainsaw. Tree removal companies may have time to do it now, but if you wish to do it yourself, prune up lower branches so that you can dig under it about 6 inches. Rent a chainsaw and saw it off. Then haul the thing away.