Hi Raaja,
I have been working as an EPM consultant for a year and previously I was an financial auditor at KPMG.
I have no history of SAP at all but in one year I trained myself by reading various sources especially BPC materials of SAP Training sessions.
After a year of experience, I have been in three projects which two of them have gone-alive and last one is currently continuing.
In my point of view, you just need to know at least some information about BW rather than FI for working on BPC area. Hovewer, I need to emphasise that my financial audit history supplies me with the process and financial information which could be an advantage of an FI consultant.
Anyway, I recommend you to take a BPC training of the located SAP center near to you before considering to apply a job without a BPC or FI history.
I hope this helps,
Mahir Parlakay,