Unfortunately I can't give you any advice based personal experiences with BFR's Ahmet, I've always held a CIR that's renewed every year.
However, from what I've heard from other pilots who have done BFR's, it's basically just a case of making sure you can take off, land, do a forced landing, basic emergency procedural stuff. I guess there's probably a bit of general knowledge on rules and procedures that they'd test you on too. Overall, I doubt it'd be very hard at all. Well within your capabilities if you've done some flying inside of those 2 years.
Without delving into the rules and regs, I'm pretty sure you need to complete the BFR on the most complex type you plan on operating in the next 2 years. Ie. if you hold a multi engine rating, then you'd need to do your BFR in a twin. Holders of PIFR ratings would need to show that they are capable of flying under the IFR from memory too.
Those last few items I'd need to research to confirm them entirely, but I've heard them from a few people.
Or, you could do as Adam suggested, and go get an endorsement or something and then you wouldn't have to do a BFR test,
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Cheers
Mick