@tomsch decooney mentioned something important that i forget about and that is to take notes which does help.
1000%, its amazing how many times we can test something, thinking we’ll remember the results each time, then comparing to 5-10 other test scenarios, moves, and end up repeating the same tests over again IF we don’t have any notes record of prior tests and results..
For me, its a complete waste of time, and potential for do-overs, if you simply can’t take notes to record results, thoughts, and findings of each test case scenario.
A few years back, I was testing 30 different pairs of vintage small signal and drive tubes in some different amps. Weeks later I’d go back and re-read the results from each test, almost in disbelief how things can be similar and so different some times.
I also do this in case our mood and hearing changes too, trying not to leave another separate day of testing in the dark when comparing back to prior days.