You say you want to learn to play the piano,but im not sure what you mean,you can play the arranger a lot easier than the piano they are 2 differnent instruments.

First I played the arranger for 10 years now,reading music with a bit of improvisation.But for the last 3 years I have been learning the piano proggressivly with a teacher.

The arranger is very easy to play.I taught myself with the Kenneth baker series of books over a 2 year period and pretty much could play anything with a little practice after that.

Playing the piano is 50 times harder when reading from music with the treble and bass cleff.
Also im finding after 3 years on the piano im taking as long as 4-6 months to master a piece.The most I ever spent learning a piece on the arranger was all of about 3 weeks.

Regards,
Daz