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Not very. Just dig as wide as practical. Idk when is best to move but I moved 3 at a random time. One has flourished and is back to where it was (I only moved that 1m, but they were all left in a trug for a couple of months while the hard landscaping was done - to give an idea of root ball. Unfortunately for the other two I chose spots that get waterlogged in winter, so one died and one is tiny.
They're a good plant for a corner.
Oh also don't plant it too deep. I think that's another thing I got wrong.
How deeply rooted are fuschias? This one in our garden has gone a bit crazy so tempted to move it to a corner next year.