"Be confident enough in your own adaptiveness and aptitude to realise that you could learn almost anything in a very small amount of time, if you really wanted

"Be confident enough in your own adaptiveness and aptitude to realise that you could learn almost anything in a very small amount of time, if you really wanted to." I don't know about that. I guess "know how to do something" and "do something that actually useful" aren't quite the same.