Congratulations on this significant milestone.
Did you have to retest? In Arizona if you have a serious TBI the doctor is required to notify the MVD, then when they think you have recovered (for me that included a neuro-psych eval, reflex testing, and other OT evaluations) then they release you to retake the exam. So I had to take a behind the wheel driving test like I was 16 again! One of the best days in my recovery!
Took me a while to get used to it too (6 months for me), so I think it is kind of like rocket science... or in my case, maybe the analogy should be like brain surgery!!!