Are you trying to learn to play classical music by reading sheets or do you just want to be able jam? In both cases, I'd suggest spending a lot of time learning music theory. A lot of the programs use pianos for a reference and could be something you use side by side, but at least a basic knowledge of music theory will help you tremendously. I took piano lessons for two years about 10 years ago but didn't remember much. I stayed active in vocal performance and theory and have always been able to sit down and play single or two lines of music without problem. Anything more complex like a lot of famous classical pieces would need a lot of practice on your own specifically at a piano. I'd still say try that after having an understanding of music theory. It will make your life so much easier and will allow you to hear things a lot better as you play. It will make much more sense.