All that is needed is a willingness to be broke. The only reason I can't change careers is because it might take years until I get to the point where I could make enough money to pay my mortgage, but that bill comes due every month.

  But there were planes to catch, and bills to pay
  He learned to walk while I was away

  When you coming home, dad? I don't know when
  But we'll get together then
  You know we'll have a good time then