I've removed the triple from my 919. It's quite easy. I have the service manual, but I didn't really need that. Prop up the front of the bike and get the front of the wheel off the ground (I used a jack and some blocks under the headers, they are strong enough. Keep in mind I had a rear stand on the back so the bike wouldn't tip) and:
1) remove the handlebars
2) removed the wheel
3) remove the fork legs
4) remove the top triple, there is a castle nut under the top triple, you can just use a flathead screwdriver and hammer to gently loosen it if you don't have the right tool.
Everything else is pretty self expalnatory. If you don't have the service manual I recommend taking notes on which order and orientaion the nuts, bearings and races go back into the steering head, that can get a little tricky. Taking pictures might help too.