Off the cuff Risk Assessment:-

1) Chance of screwing up without a manual :: > 75%
2) Chance of screwing up with a manual :: 50%*

Also ... chance of the tech being a "she" :: < 5%

The term "half a chance" is a turn or phrase, an idiom, and is not (usually) to be taken literally. Substitute the word "opportunity" if you like. smile

* According to your reckoning.

If you don't inspect ... don't expect.