You probably don't want to do this. Well, stop at the Promontory viewpoints. The hike the mountain stinks. If you need to do it, download all the publicly available tracks, and try to stick to the center of all of them. Especially, use your track from going up to find your way down. The path is "just stay at the top of the ridge" except at the points where it isn't. Start early. The trail is very straightforward (old road walk or somewhat unmaintained trail) until it absolutely isn't.