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I was worried about this when I started. The truth is, you can still get a sharp edge if your angle game is a bit vague. As long as you’re between 15 and 20 degrees per edge, and when you’ve sharpened to the edge you go by feel, you’re fine. For the 15 degrees, I always go to 45, then look for a third to less than a half of that. The common advice of putting 2 10p coins under the back never made sense to me because knives have different widths, hence you will get different angles. Practice is your friend.
You can just use wet and dry paper ;)
Says he who gets caught up with getting the angles right and doesn't do anything.