I have recently removed it in order to install a much larger version with heating. I found that it was much easier with the bumper bar removed and headlight removed. This is because the two bolts which hold the bottle in position are under the headlight and behind the bumper.
I was quite capable of removing and install the bumper without even touching the steering wheel or wheels. The hard part is knowing where to start.
First of all remove the front lower wheel arch cover. This is the one concealing the washer bottle. This will expose the pumps and wiring. From there look down the engine bay and see what you can find in terms of access to the bolts at the top.
The bottom is held in with friction on a rubber plug. The filler neck also has a seal plug that fits into the bottle.