Once you climb up from Warren Canyon you find some beautiful Meadows. Just follow the creek threw the meadow and as it turns up toward the rubble filled chute that will fill take you to the notch.
Head for the notch -- the rubble isn't as bad as it looks.
I'm not past the notch - that's Warren in the center. Don't stay in the gully, but climb up on the ridge/plateau once you get to the notch to make it easy going the rest of the way.
I'm up on the broad ridge/plateau - as you can see, it is a nice easy hike to Warren's summit from here.