I agree, it's good to wait. I was completely obsessing over FFS back in early transition because I was so sure that I had facial features that would never look feminine. But then all of a sudden around the 15-month mark, everything rapidly fell into place, and now I don't even think I need it anymore.
People who do it early in transition are usually just as happy as people who wait, because it almost never hurts your appearance or sense of self to have it done, but if you're on the fence about whether you need it or not, or if money is an issue for you, I'd wait. Your appearance really doesn't start settling down into being near its permanent state until around the 18 month - 2 year mark. I'm at 19 months on HRT now, and I've been growing a LOT of cheek fat over the last few months that has significantly balanced out my chin and forehead and tipped the scales definitively into the female range.
It's not that FFS will hurt you if you do it early in transition, (unlike BA, which is a VERY bad idea until you've reached your full natural development,) it's just that you might end up not needing it if you wait a bit longer.