its really simple, theres 2 dirty great alan key screws that hold the hings on and 3 that hold the opener on, when i did mine, i couldn't fathem out how to get the opener off the glass without braking it, if your carfull you can cut round it and still have a nice looking job
Okay, two person job.
Rear seats down & boot clear of garbage, one person outside supports the window to be pushed out while the other lays in the boot and with their feet pushes the glass out at the edge.
Slowly work your way round. I'd recommend starting at the top edge and working to the bottom, also if you've got access to a suction grabber use it to let the person outside keep hold of the window better.
This takes a fair amount of force but be careful and take your time, getting it back in I never mastered without getting air gaps in the seal.