Mine was fairly easy.
the sprocket hub was not pressed on. After you take the lock nut off (remember the 2 allen screws, loosen those), and the brake caliper off, the disc brake and hub slides right off. Form there I tapped the axle out a little bit towards the sprocket side so I could get some area to play with. I then took a rubber mallet, and tapped the sprocket hub back towards the carrier. You'll notice a little snap ring under the sprocket hub. You'll have to remove it. Then slide the axle back out the opposite way (back towards the brake side) and the sprocket hub will come right off. I did not have to unbolt my disc brake from it's hub, nor the sprocket from it's hub. Installation was a little tough, cause the LSR was such a tight fit. Lots of grease, and the rubber mallet you'll be in business.
Hope that helps.