Thanks so much Jennifer. Your list should help out a lot of us that aren't that experienced.

3. When you shop, say it's for you. I struggled with this. I always used to lie and say "Oh, it's for my wife." Thinking back, I don't think one store associate ever believed me. I finally got the courage to go to a Lane Bryant and ask to try on clothes for myself...and the store associate darn near hugged me! I spent 100 dollars and walked off beaming! Most store don't care at all. Seriously. And most shoppers won't say anything, either out of fear or lack of care. Heck, after a while, you might get good enough they don't notice. Besides, if the store refuses to let you try on clothes, would you want to shop there anyway?
5. Talk to people. I still suck at this, but seriously, talk to people. Ask the store associate how his day is going. Tell the mom standing next to you her baby is beautiful. If nothing else, simply pay someone a compliment. Nobody is going to scream "Oh my gosh you're a crossdresser!" if you pay them a compliment; in fact, they'll probably smile and you might just make their day.
I'm assuming that #3 you're shopping in guy mode, but in #5 you're in fem mode. I've never shopped en femme, but either way it seems better to start a nice conversation with the SA. Many will think you're weird when they see you come back a few times buying more female clothing, so I've only admitted that I'm shopping for myself a couple of times. But if there's no dialog, there's a bigger chance they'll think negatively. For me, it's a difficult step to come clean.