In a place like NYC with such an over saturation of very qualified applicants your chances of working 911 early on are slim. 6 months is good. A year is better. I'm sure there's guys there 2 and 3 years into an IFT job that they didn't get into EMS for.
Having done it myself, the best advice I can give is don't be tied down to a specific area you want to work 911 (ie NYC). Figure out how far you'd be willing to commute, if you'd be willing to move, and look at options for paid gigs out of the high population areas. I commuted 3 hours one way for a 911 job, and ended up moving out there after I realized I really liked the area. If I'd stayed in LA I most likely would still be working IFTs. And while it was valuable experience and a great place to start, was simply not what I got into this field to do. I'm sure there's some folks on this forum who could suggest some paid services in the greater area.
It just comes down to how badly you want to do that specific kind of work, and how attached you are to your current location and your comfort zone.