Altitude will be your biggest issue on this hike. If you can, get to Tioga Pass the weekend before (or even closer to the hike), and climb Mt Dana. That will put you up at 13k for a short time, and might help with the acclimatization.
On the hike, drink LOTS of water -- something like a pint an hour. When people hike at altitude, they often don't feel thirsty and don't drink. The dehydration will cause Altitude sickness to set in a lot sooner. Bring electrolyte powder to add to the water - many people suggest half strength. Last water is at switchback #22 above Trail camp. Take three liters from there: one for the switchbacks, one for after Trail Crest, and one for the trip back. And read up on water filters -- old timers dip and drink -- no filter or anything, which saves weight, time and energy.
Bring snacks -- granola bars, trail mix, candy bars. Eat often, and keep in mind that altitude kills the appetite, so eat more early into the hike, since you may not be able higher up.
