It happens remarkably easily. But like every other mistake, this is one you frequently have to make for yourself to understand why it's a mistake.
The trick is having enough introspective capability to identify when you have made a mistake, and not fall back on dogma to say "I followed The Path, so it can't be a mistake".
The trick is having enough introspective capability to identify when you have made a mistake, and not fall back on dogma to say "I followed The Path, so it can't be a mistake".