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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.
I finally bought a water stone and sharpened my knifes. I don't know why I've been so hesitant and paid other people (pros) to do it. Got them very sharp and it was a great new skill to learn.