Welcome!
I also have a very early morning commute! I would say that a good, bright, blinking front and back light is a must. Take the lane, and be sure that your rear lights are pointing in a direction that makes them highly visible to drivers.
Confidence will come with time. I usually assume that people are drunk (I used to have to use E Carson for my early morning commute - least fun ever.), so I try to make sure they see to avoid me if necessary.