The method I provided is better because you can actually see the barriers while you’re editing too. And, it’s one less step (which doesn’t really matter here but it’s still one less step).
Not a bad first guide! mysz’s points are valid, however. There is a much easier and simpler way to do this, and this isn’t really a guide that needs to be made. Still a decent first guide.
Find a problem
See if your problem has already been solved
If not, attempt to solve your problem.
Then make a step by step tutorial/guide on how to solve your issue. Make sure it’s not something too basic, but not TOO specific. Like how to make a Mona Lisa statue using pixel art with smiley emoji text