Guess I will just need to keep practicing with the cheap knives until I can feel the edge better. Currently I've been doing it mostly by sight. I visually try to start each slice or scrub at a consistent/correct angle, then just pay a lot of attention to KEEPING that angle. I considering getting one of the angle guide things that people have mentioned, but for various reasons I see there are drawbacks to that approach, it feels very limited and kind of a crutch that will block learning what you really need to know, so I'm skipping the whole angle guides thing.