how did you do this in the face of social phobia? do you ever struggle with eye contact or voice?
first - i try to choose an environment in which i feel comfortable - not all organizations are the same. i doubt i could work for very long at a place in which i constantly felt intimidated by my co-workers/colleagues. instead, i'd rather work somewhere where i felt comfortable being assertive. i've been fortunate enough to find jobs like that most of the time (the other times really took a toll on me).
secondly - most of my adult life, i've been in management or held positions of authority. the character i perform in the role of each day comes with the job title.
third - it takes alot of energy to be "on" all day in front of employees, co-workers, supervisors, customers, and the public. so depending on how much fun the job is or how stressful it is, i need more or less "down-time" when i'm off work to recharge. i will admit that there have been many times that i did little with my life other than work and recover from the workday.
4th - the hardest part is interacting with the boss. so while i may appear to be confident in my day-to-day dealings with everyone else, i'm still nervous about what my boss thinks of my performance - this is where i have the most problems with voice and eye contact and communication in general (my natural tendency is to avoid, which usually only works for so long).