The MMWT is one of those trail where an experienced hiker can go solo. If your plan is to day hike and leave in the normal starting range, you will be within the pack...you won't lack for company.
As an experienced SoCal hiker, the only problems you might encounter is the elevation above Trailside Meadow and being able to read the weather at Trail Crest. Some wall out over 11,500' and first real place to get a read on the weather is usually Trail Crest...unless the thundering or the crest is clouded over.
I would suggest you come up the the Eastern Sierra about a month prior to your date and do White Mountain or Mt. Langley and drop in for a look at Whitney Portal. This way you find out what it like to hike to 14,000' and you know what to expect when you drive up to Whitney Portal for your rendezvous with destiny.
