The person who learns slowly may remember exactly where another learner will struggle.

Learning quickly leaves no record of the difficulty. The person who got it first time cannot tell you where the confusing turn was, because they never took it, and their explanations skip the exact places where everyone else falls. Someone who struggled has walked every one of those. They know which word is misleading and which step secretly contains two.

Ask the person who found it hard to explain it to the next beginner. If you were that person, offer what you know about the traps rather than apologizing for how long it took. Slow understanding is often the version that can be handed on.