Fear has been a big one for me too. I was raised with a lot of fear, in a family that always worried. It's an onging endeavor to train that habitual response out of myself.
I too have had to face some big fears in order to create the life I want for myself. Sometimes I succeeded, and had the great experiences like you describe of your going to London. Other times, I couldn't do it. I just couldn't get myself to walk out the door or get on the plane. It was too big a leap. But that's okay, because going back to #6 above, no reason to blame oneself. Just continuing in the commitment to question fear instead of accepting it and being controlled by it.