Being an extrovert and an external processor (one who gains energy from hanging out with people, talking about things, processing information out loud), it is the non-dress-code aspect of tzniut that gives me the most trouble. How to speak modestly. It's not just speaking with humility, like not bragging about a raise or what your child did that morning. It's about not sharing every sordid (and maybe not sordid, just personal) detail of your life with others.
When I am struggling with an issue, my first impulse is to verbalize it, call a friend or write an email or a blog post. The problem comes in when there is another person involved-- and really, even when it's something in my head, there's always someone else involved. The closer they are to me the more I feel responsible for not embarrassing them by sharing too much.
It's a fine line to walk- telling your story to get the support or help or guidance you need, while not telling someone else's story at the same time.