you CAN move it now, but , unless it's " do or die" I'd leave it until it's dormant in winter
Sorry just seen date of original question..Aug.removed comments.
That one's lovely @Silver surfer . I hope my baby seed-raised ones get that good in a few (or several) years.
Prepare the new planting hole first, and dig it up with as much of the rootball as possible. Avoid cutting/breaking roots if you can, it's the fine ones at the ends that take up water and nutrients so you don't want to lose them. There's no need to prune as you're moving it while it's dormant, unless you need to take off some growth so that you can physically lift and move it. Pruning when moving a plant that's not dormant reduces the burden on the roots, so that they don't have to support as much foliage while they settle in. Water in after moving even if it's raining, to help settle the soil in around the roots, but as long as the weather stays wettish it shouldn't need a lot more water until it starts to come into leaf, just enough so that it doesn't dry out. But do water after that, particularly if there are warm dry spells in spring and/or summer, the same as you would any newly planted shrub.