Here is what I do when I want to move a shrub .. haven't lost one yet with this method.
I take a long knife like a bread knife or shovel and cut a circle about a foot to 2 feet away from the central trunk of the shrub. You want to go about a foot and a half down. Once done, leave it alone for a a few days and see how it reacts to the root pruning .. if it starts to wilt or look stressed, leave it alone until it recovers ... otherwise dig up the root ball and put it where you want it.
You might want to wait until it stops blooming though.
