No, dead easy. Just pull the spring clips off the original ones, and push them off, just mind the hatch doesn't come down on your head when you do it (it's a lot heavier than it looks). Then clean up and grease the mount points and the new ones just push on.
My hatch wasn't opening all the way today as the struts are obviously a bit stiff. I put some GT-85 on the stanchions and they're fine now.
My car is with Powerflow exhausts in Brighton today getting a new custom made cat back exhaust. I took it there to see if I could get the baffles repaired in the backbox, but it's a s**t system that's had a not particularly good silencer poorly welded and clamped to the original mid-pipe. There was a crack in it and most of the rubber mounts were nearly gone. So It's £380 + VAT for a new exhaust. Warrantied for life, so should see me out.
Some of the options I could choose from for tailpipes were truly horrific, like a twin 5" rainbow dipped nightmare. I've gone for a fairly large back box and a resonator (so I don't upset the neighbours or get that 2k rpm drone) with a 3" rolled tailpipe that looks similar to the OE 182 tailpipe. I could have gone for a stealth option to keep it original looking but the droopy things looked a little sad on the shelf. I'm not cutting the bumper though so I will look a little bit of a chav, but I can live with that.