Campgirl64,
If you're nervous about your trip, I'd suggest to build in some days to acclimatize (though coming from Utah, you might not have any issue with altitude)and familiarize yourself with the route from maps and books and chatting with those who have climbed it.
Go slow and steady.
Minimize unessentials in your pack. As others have said, you could probably do lighter, especially if you're sharing a tent. My pack only weighs 35+lbs when I carry a tent/20*F bag/DSLR and camera gear, cold weather gear and 3+days of food.
ON Shasta where there was NO water, was one of the few places I carried all my water.
If you have any other concerns/questions, ask specific questions, happy to help out.
Good luck!
