An old topic. Trying to reach a level of perfection is not a good approach. Doing things fast and with a minimum of care if a disaster or, better I could say, it's random: Sometimes the result is amazing and most of the times it's not. What's the solution? There is not solution but experience helps. It will say if something works or not. To improve that superpower experiments are needed.
Perfection is not possible and not recommended. Excellence is the right way.
Here the test page, one of the last pages on every notebook I keep there to try inks and effects without any care. Now I realize it's so great and it has a touch of freedom. And it's much better than other pages.