DO IT!! Get out on the snow ASAP!!
But go real cheap so your mistakes won't hurt as much. That's what I did. As the famous physicist Neils Bohr is quoted, "An expert is someone who has made all the mistakes that can be made in a narrow field". With your bindings, that's one less mistake to make on your road to expert status. Wonder if many of the experts here can say never made any from day one. Guess it's possible with a truckload of cash at your disposal and/or your family has skied for generations.
Sounds like you have already made one mistake with the bindings but you can probably find good used ones for $50. You would have probably needed to have the bindings remounted on your skis anyway as your boot size likely different from who used the skis before you. $20-$40 to get them mounted and checked.
Download the 2010/11 Indemnified list here so you know what your buying. If it's on the list a shop will mount and test them.