It wasn't complicated, but it was hard. I'll try and explain.
We removed all the packaging and started faffing about with hoses and stuff. Luckily I wondered what the complicated diagram glued to the top of an odd piece of packaging was, and investigated further...
There are bolts that screw through from the back into the body to stop the drum rotating. You need to get them out, which needs the right size wrench. Then the rubber plugs, some of which fall inside. That's ok, you tilt the machine and they fall out the bottom.
Now you block the bottom with the odd piece of packaging I mentioned earlier. Easy. But to do it you need to tip the machine up to expose the base. Not easy- ours slipped out of our hands and landed face first on the floor.
Only now do you get to mess with pipes (the bit i thought was the hard bit).
Top tip- if your machine is like ours, get the stuff out of the drum, check the instructions, you may want it face down for the plugs and bolts and putting the base on. So save the packaging or get a thick mat to protect it.
It wasn't hard, but it was 'fiddly'- like wrestling with a greased pig.