It's not that difficult at all, especially if you're fairly mechanically inclined. Just allow plenty of time and don't rush. It helps if you have the bike on a paddock stand so it's vertical and slightly lifted. Good lighting, including a mobile light, helps a lot too.
DEFINITELY transfer the seals and clamps directly from the cat to the X-Pipe BEFORE installing the X-Pipe and mufflers.
You will have to loosen the frame tubes on the left side, but it's really not a big deal.
In any case, IT'S WORTH IT!