Here's a quick summary.
The job can be individual/number crunching based (insurance) or it can be client facing/team oriented/number crunching based (consulting). I work in consulting, and I can tell you it's actually not boring once you're above entry level positions.
The exam system is long. I believe in the US it's a total of 8 exams, two assignments (a 30 day and a 96 hour), and a bunch of modules/mini assignments (3 are marked formally). You can find all the info here:
http://www.soa.org/education/exam-req/edu-fsa-req.aspx
The top part is to become an ASA (which I am) and the second part is to become an FSA. In Canada you lose two exams, one becomes longer, and you have to take a 3 day course which is topped off by an exam.
I've read that the average age to become an FSA is around 30, which seems likely based on when some of my colleagues said they achieved it.
The job is pure number crunching when you start, then moves into review, then either client facing or management. Once you become an FSA you can sign reports and at that point you are setting assumptions and doing the highest level of review. Pay is quite good at all levels.
You have to be VERY good at math to get through an Act Sci degree and then the preliminary exams. After that the exams are easier math-wise but require extensive memorization.
Hope this helps.