My advice as always is: Get Doug Thompson's Book, "Mountain Lore from the Whitney Store".
#1: Get in as good of shape as you can
#2: Hike a few times at elevation if you can. By that I mean, get to 10,000 feet. If you're from SoCal, there are a few over 10,000, Baldy, Gorgornio and San Jacinto.
#3: Hike, hike, hike
#4: Get to the Portal early to acclimate, walk around a while, talk to people at the store, rest and read. Have everything ready for the hike....relax.
#5: Most Important: Enjoy your friends on the hike, take pictures and have fun. Don't make the summit the goal. Make your friendship and the experience the goal.

"Turtles, Frogs & other Environmental Sculpture"
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If less is more, imagine how much more, more is -Frasier