GMs- do you think about your "GM persona" at all?
I've never run a game here on my own, but I've helped other people run games here.
One of those games was Pathfinder based, and involved several learning experiences for the characters. The players often would ask me questions ahead of what their characters would do, and I, in keeping with what I was supposed to be doing, couldn't tell the players if something would work, even if they asked. Now, this isn't normally me, normally, if you asked me something, and I knew the answer, I would usually tell you, but that was against the point of this subplot of the game. It got easier as everyone began to realize, they were told, but it hadn't really sunk in at first, that learning things was important at this stage, since for various reasons some things were not just known. This game wasn't using the default Pathfinder world, and magic was kind of different. Also rituals were in play, and learning how rituals worked was also supposed to be mysterious.
So, what I had to think about was how to encourage players to learn, without spoon feeding them information, and also without giving away any information they were supposed to learn on their own. It required a fair bit of thought on my part, and a lot of post action reinforcement.