I guess maybe I'm one of the lucky ones. I can do two things that others seem to find hard. The first would be to look in an index, and if I need information about the footpedals, look under the letter F and lo and behold! There it is... Pretty difficult, I admit, but once you learn the alphabet, and to read, not all that difficult. And secondly, to TRY things out. If you back up your memory (probably the very first thing I look in a manual for information about), what's the worst that can happen? Push buttons... press things. See what happened.
Just like a baby, if you never progress past NEEDING to be spoon-fed, you are dependent on others your whole life. And you never discover something new, something your spoon holders never knew, maybe even something the manufacturer never knew!
Nobody's life hangs in the balance operating an arranger. No-one will die if you don't follow a proscribed step by step to achieve a specific goal. Truth is, the same people that can't figure out an arranger from the manual can't program their DVR's or figure out how to book a flight from their cell-phone.
But most people can.
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An arranger is just a tool. What matters is what you build with it..!