Its nothing too terribly technical, just a lot of sustained climbing and fun downhills. The climbing can all be done in the middle ring, and the downhills will tempt you to go faster and faster then throw some sort of hairpin S-turn in around a blind corner. The trail is very narrow, so if you're not on your game (ie looking around, fiddling with your pack or computer) things can get nasty really quick, with nowhere to bail out.
The exposure (read:constant exposure) isn't going to kill you, but if you go off-trail, you might be lucky to get out by yourself. The overall smoothness of the trail invites complacency. This isn't like Desert Classic, where if you make a mistake and go off-trail and crash where you can just dust yourself off and continue. You'll be taking a downwards tumble and some of the falls will be about 25-50ft. The trail is only about 16" wide in most spots, and is mostly bench cut into the side of a mountain. If all you ride is Desert Classic, it may be out of your league. If you feel comfortable on National in some of the sketchier parts (like the catwalk) you'll do fine.
You can do it on your own, but I'd recommend heading out with a friend, just in case.