I, too, can be quite a control freak. Submission has helped me with that so much! I'm learning when/what to let go and getting much better at drawing boundaries in my every day life - when someone tries to make their problem into my problem, I just don't get pulled into it! My confidence in myself has gone up immensely, but not in an obnoxious, "I know best" way, just in a quiet sureness of who I am, what I'm capable of and what my true daily responsibilities in work and life really are. I'm just more relaxed on a daily basis in my work and all my relationships: friends, family, coworkers, etc - not tense or stressed out all the time. It's really nice, plus friends and family are actually beginning to notice!
How do I go from the everyday me to the submissive me? Permeating my day is the knowledge that I belong to my husband (to an extent that I don't think he even realizes completely) so when I come home, making the switch isn't terribly difficult. If I have a block (work problem, etc) in my mind, I do something mindless, like wash dishes, and by the time I'm done the problem has been put away. Taking a nice hot bath or going to work out at the gym helps too!