The specific instrument will have a big impact too. Most organs around now (which is an unspecified period of time after when you’re speaking of) have two manua

The specific instrument will have a big impact too. Most organs around now (which is an unspecified period of time after when you’re speaking of) have two manuals, each of four octaves, one octave of straight pedal board, lacklustre voices and speakers, and issues of at least some form (e.g. a few notes that just don’t work any more). They’re just not particularly fun. But get one in good working order with three manuals, two of which have five octaves, and two octaves of properly curved pedal board, and power, and it’s altogether another matter: then, if you’re a child, your only difficulty will be that your legs aren’t long enough. It’ll be more enjoyable, and even a bit easier to play (though the difference in ease of playing won’t be as stark as between a poor upright piano and a good grand piano).