If you plan on pursuing this career, I would suggest spending at least a year with a Hyperion Partner or Oracle. The first couple of applications you build, no offence, will be suboptimal. By working at a firm you'll get exposed to multiple implementations and you'll get to see first hand all the parts working in harmony or not in harmony.
You have the chicken and egg dilema. There are not that many folks that want to hire an independent for their first Hyperion project, actually there are probably not any unless you are willing to work for free.