I have a large Berberis which came with the garden, it's a bit lanky and outrageously thorny, but has very pretty orange flowers so I'd like to keep it. Problem is the kids' tree house/ platform thing is directly above it and it hangs out into the lawn where they run about. At the moment it's a bit like an opening sequence for casualty. Question is can I move it? If I can when is the best time? Also can I prune it hard before I move it as I don't even know where to start with the thorniness of it.