Patience , staple gun , air compressor , patience , friends , beer , patience .
I remove it off the bus like pictures show, it goes really fast with the air stapler gun.
Remove plastic liner (where staples go) very carefull, it could be dry and fall apart.
I fitted 1 to mine about 3 months ago. The just kampers canvas seems to get bad press but i could'nt fault it to be honest.
Although it seems like more work, take the whole pop-top section of the roof off to fit it and lift it on as 1 piece.
Also use a decent staple gun and have a couple of people to help. Not a hard task, it's just takes abit of time.