If you are aware of ADO, and have coded in it, then the odds are fair that you aren't too engine specific. The Jet database engine requires some "interesting" things in code that send more mainstream SQL implementations howling into the trees when you try to run the resulting application against them.
I'd suggest that you just jump in and try it. You know your app better than anyone, take it for a spin! Be forewarned that there are rarely conversions from Jet without at least a few bumps and bruises, but they aren't nearly as bad these days as they used to be!
-PatP