Only thing to add to Steve and 2600:
I used the route in blue from the last photo 2600 referenced(and I actually used the same photo to climb Mt. Muir), It was immensely helpful.
I had only done Langley (like you) when I first tagged Muir. The lower 3/4 is straight forward. However the mantle onto the summit proper was almost too rich for my blood. You have to wedge yourself between a leaning block and the summit block, I just decided to slide up on my belly and tap the high point before I boogied on down.
Good handholds and footholds. Breathe deep and trust your hands and feet and you should be fine.
