Replanting a messy border

Ideally, next month would be better for doing that but, having said that, I'm always digging things up if they're in the wrong place or just not striving.  The best way to do it is to make sure the plants are well watered, preferably the previous day, and to keep as much soil round the roots as possible.  Keep the pots out of the full sun for a week or two until they get settled or you're ready to replant and never let them dry out.

or if you dont have enough space take cuttings!