Like you, I am currently teaching myself how to play the organ but my main concentration is piano. The kind of organ that I am working with is an pipe organ because the church where I usually to go to practice piano does not have a Hammond organ. But, anyway, on an organ, you will be using the pedalboard with your feet and you have to train your feet to know the distance between each note. Just like you type on the computer keyboard without looking, you have to have peripheral vision when it comes to using the pedalboard on the organ because you can look down when you play. You have to have a picture of the keyboard in your mind so your feet will know where to go. And of course, the organ in much louder than the piano. Also, on the organ, legato notes are mostly played. When staccato notes are played, it makes the organ sound kind of bumpy in a way. My cousin used to be an organ player and back then, she told me that you don't play the organ the same way that you play the piano.
