Chicago,
Here's my 2 cents, a little different perspective. I agree with the adovates for later summer hiking when the snow will not be a problem, especially since your a novice. I've completed day hikes on the main trail the past two summers in August. Keys to success include plenty of physical conditioning (can be done anywhere) and altitude aclimation (need the mountains). Start training now if you do not exercise regularly. Focus on cardiovascular endurance and strength/resistance training. Work your way up to 3x weekly for both. Add hiking to the mix and work your way up to 6 to 8 hour adventures once weekly at least 2 to 3 months prior to Whitney.
As far as the altitude adjustment, aside from climbing mountains, if you're unable to get in any high altitude practice before the Whitney trip, you need to plan to arrive (ideally) in the eastern Sierra 5 to 7 days prior to Whitney. Go to Mammoth Lakes area for the first few days to acclimate and have fun. Hike up to the top of Mammoth Mt (11,000ft - take the gondola down - it's free if you hike up) on the 2nd day, go fishing or boating on one of the lakes the next day. Take the shuttle to Reds Meadow/Devils Postpile and hike to Rainbow Falls on the PCT/JMT. On your way from Mammoth to Lone Pine, take a detour and go to the ancient Bristlecone Pine Forest (White Mt) Hike around at 10,000 ft. Arrive in Lone pine 2 to 3 days before Whitney day hike. Go up to the portal and get acclimated - take a preliminary hike up MT to Loan Pine Lake - have lunch at Doug's (Portal Store). If possible drive up to the Portal again the next day (prior to main event), or some other location above 8,000 feet just to hang out and relax (and breath rarified air).
Have carbo loading dinner at Pizza place in Lone Pine early on the evening before your Whitney hike. Get some rest. Arrive at Portal trailhead by 4am (no later). Take ibuprofen before you start to hike. Plan on 7 to 8 hours to get to the top. If you've done all the prep, and the weather cooperates (It's usually fair by mid Aug), your chances of summitting will be pretty good. Plan another 6-7 hours to get down. Take another dose of ibuprofen on the way down. Your knees will thank you.
None of my suggestions require overnight camping. Stay at the motels - be comfortable - take day hikes - Read Doug's book on Whitney Lore as previously mentioned - great insioght and tips for success) Hydrate constantly (I prefer sports drinks like Cytomax - but that's another whole story) Be prepared - Take lots of photos. Most of all have fun !!!!
