working through all the Calif 14'rs. Didn't do Muir when we did Whitney, but going back this fall. I couldn't find "the" way up last year and did Whitney again instead.

Have found some good resources on finding the route up - question: what protection is recommended?

Most people just scramble up without protection. It is pretty simple fourth class climbing, maybe even third class. Hand holds required, but you aren't hanging out over a sheer cliff.

I climbed Muir as my first 14er on the way to Whitney in 1988. The part near the trail is easy but a bit loose. The upper part is nice class 3. I've been back 10 more times, including January 1993 with a foot of fresh snow on it. I did it again just last month. I never brought any protection.