RE: adjust the CG or trim
Define factory settings.
Do you mean set it where the book says to set it?
This is good advice because a beginner would have no real idea what to do with the CG. Saying nose heavy means what? As I said, if the thing falls off of the balance point and digs the nose about three inches into the ground, it's to nose heavy.
But, one would hope that beginners follow what we've been trying to drill into them for years now.. do this with the help of an instructor or someone with a good solid RC background so that it's done right the first time. Doing it alone, as a beginner, is simply the blind leading the blind.
CGr.