Remember, unless you have a formidable ear, and the determination to succeed at all costs, a teacher is the shortest route to musical fluency. Sure, you can take a brute force approach to teaching yourself, but I guarantee that will take you more than the "14 hours a day for 14 years to get a piano diploma" hyperbole to achieve anything more than plonking down the basic chords on your arranger and playing some half-assed poorly timed melody line on the top.
Sure, you don't have to go the full conservatory route, but a teacher can save you YEARS of mediocrity. You just have to pick the right one. Shop around, and you can find many that specialize in teaching ADULTS to play. And you are less likely to get the purist approach...
Mind you, they still have a certain point. Looked at in a certain way, playing an arranger is NOT 'playing' music (here we go again
), it is learning how to direct the arranger to 'play' the music. And there is nothing wrong with this (before I get flamed again!
), as long as you realize that is what you are doing.
Let's face it, unless you can actually PLAY each of the arranger's parts at least as well as the arranger can (mute each one out and try for yourself), you have to admit that there is still a ways for you to go (if learning to do this has any importance to you at all - you ARE going to need those skills if you ever progress beyond playing an arranger, or wish to create your own styles), and studying and practicing are the only routes towards this.
But playing keyboards is a real challenge, because not only do you have to learn reasonably decent pianistic chops, but as soon as that is mastered, you have to throw it all away, and work on organ chops (very different, IMO), and then on learning string technique and voicings, horn techniques, emulation and voicing, and all the myriad other sounds in a keyboard (arranger or otherwise)....
Or you can simply bang out (roughly) the right chords to an old favorite and play (roughly) the right melody over the top of it. If this is all you want to do, read no further... But should you wish to progress further than this, a certain degree of accepting that you are NOT playing a real instrument, you are learning how to emulate a real instrument (or three!), and understanding a teacher's perspective might do you a lot of good!
[This message has been edited by Diki (edited 05-19-2008).]