Posted: 19/03/2017 at 20:27
I (with some help from my BIL) dug one out here a few years ago - during summer. It had plenty of rain to keep it happy, so we got away with it. If you want to move them in summer then make sure you can give it plenty of water, otherwise, autumn is probably better, as nut says.
It was about the same size as yours, and we had to hack it back to a couple of feet to get in at it. It was just put into a bit of spare soil and stayed there for the winter, or possibly longer, as I didn't have anywhere for it to go. It's now in a corner of the front garden boundary and is a good metre high and wide and perfectly happy.
They can take a fair bit of abuse and neglect without any long term damage, but B'cupdays is right - they aren't easy to get out!