If you have to relocate any, then do it now
Don’t move shrubs and trees too often – only do it if you really need to. They may have been sited wrongly, or something nearby is overshadowing them, and now’s the time to move them if you must – but be warned that lots of shrubs and trees will find the process stressful.
They key is to make it as easy for them as possible, so the impact of transplantation is lessened. The bigger the plant, however, the more stress and difficulty it’ll cause it – and you! The likelihood is, though, that you’ve got a young shrub, less than a year or two old, which needs moving to a better spot and, thankfully, young, small plants don’t mind being moved as much.
Both deciduous and evergreen plants can be moved now. If you can, choose a dull, non-windy day – a bit of rain’s not a problem – so the weather isn’t against you and the plant roots don’t dry out. Don’t try to move extra-large trees – hire a contractor as it’s too much work for one person! Once transplanted, make sure the plant is adapting well and water evenly and mulch well. As with any establishing plant, fertilise it in early spring as encouragement.