...
1. The route...it is a trail. Its not very hard to follow.
To expand on wbtravis' post -
The trail thru (Old) Army Pass and above it for about 1/2 mile is well-defined and in good shape. Above that ... it becomes a series of paths. I prefer a Class 1 route, which means staying to the far left on the last 1,500' of vertical or so, and doing the last 1/2 mile or so of the summit massif from the west.