Never doing a test stream is the mistake that lets unknown configuration problems hit live audiences instead of being caught in private. Every change to the stream setup (new equipment, new OBS version, new scene, new game, new bitrate) should be validated with a private test stream before the next live broadcast.

The test stream procedure: set OBS to "Unlisted" or "Private" mode (or stream to a test channel rather than your main channel), run the stream for 20 to 30 minutes performing the actions you will do live, watch the frame-drop counter, watch the bitrate stability, and review the recording afterward to check audio levels, scene transitions, and overall quality.

The 30 minutes of testing catches problems that would have hit live audiences and tanked the session. The cost is one private session. The savings is every public session that would have suffered from an uncaught configuration issue.

The discipline: before any major change, run the test stream. Build the habit. The streamers who never test are the streamers who occasionally lose entire live sessions to preventable problems.