Okay, take this analogy I've seen. Say you have an infinite staircase. You have to prove that every single step is painted yellow. Of course, if you chase after it and count every step that'd get you nowhere because your staircase is infinite. So what you do is prove that if a step is yellow, it implies that the step above it is yellow, and then show that the step at the very bottom is yellow. Done.
Oh, hahaha I remember I had a year 12 assessment on maths induction last term and I got mmmmm.....4/30. lol. Of course, without preparing at all for it. Concentrating on 2u more. 3u for me = zilch.