If you believe you can, you probably can. If you believe you won't, you most assuredly won't. Belief is the ignition switch that gets you off the launching pad. ↗
When I meet people who say - which they do all of the time - 'I must just tell you, my great aunt had cancer of the elbow and the doctors gave her 10 seconds to live, but last I heard she was climbing Mount Everest,' and so forth, I switch off quite early. ↗
The growth of technology is such that it is not possible today for a nuclear physicist to switch into medical physics without training. The field is now much more technical. More training is needed to do the job. ↗
What is special about VOIP is that it's just another thing you can do on the Internet, whereas it is the only thing - or nearly the only thing with the exception of the dial-up modem and fax - that you can do on the public switched telephone network. ↗
These sorts of things can happen, identities can be switched, the emotional implications are something that he has not been trained to feel. His whole life has been about separating himself from these sorts of actions. ↗