Don't forget to allow some time to acclimate to altitude before you hit the trail. At least a night car campimg, someplace at a high trailhead helps- like Horseshoe Meadows, North Lake above Bishop, or Mosquito Flats above Tom's Place for examples. This year is going to be bad for skeeters in all likelihood, so a head net and light long sleeve shirt (not cotton) would be helpful. A fleece or puffy (down jacket) would be good, as it will be cool in the evenings. This can also extend the range of your bag, too. A merino wool watch cap or warm hat of some kind would help, too. Rain gear? Don't go cheap, Sierra thunderstorms often have high winds with them and cheap stuff will tear apart. Make sure your tent is built to withstand some wind, also. Look at some gear lists and ask specific questions if you are in doubt. You may or may not like trekking poles, but they are helpful in lots of ways and this year with run-off going to be way into August, some creek crossings may be very tricky. Poles help tremendously for crossings. Of course,just don't if it looks bad! In 2011, the last high water year,log bridges got taken out, and weren't replaced immediately. Sounds like a good adventure!