When I first came out in Los Angeles 8 years ago, I remember visiting Glamour Boutique LA.  The store used to be Jim Bridge's Boutique before he retired.  The new manager was super friendly and supportive.  It is where I bought my first corset and breast forms.  Unfortunately when they lost their lease, the manager decided to move on.  I was never impressed by Contessa's Closet.  It seemed overpriced and full of cheap jewelry and clothing that wasn't any better than Claires or Ross.  I don't miss it but LA does need a good TG-focused store.
If all you need is makeup, I recommend the MAC counter.  It may be mainstream but it is great value.  They will give you a free makeover if you buy $50 of makeup.   At the store I visit in west LA, one of the makeup artists does drag in the evenings so he knows all the tricks. 
I would also be willing to help you myself, though we would still need to go shopping for makeup to find the right skin tones etc.
I would be curious if anyone try's Gina's or Femme Reflections.   My profile pic on the right is from a makeover I had in London (they have some great services there) but that is bit out of the way 
