Hi Phil,
If you are not already overwhelmed by all other advice ... check out the slides from my 4 hour presentation on Theory and Practice of the Nanovna.
/g/nanovna-users/files/Presentations/20191220_ON7DQ_NanoVNA_Presentation_English%20V2.03.pdf(if the link does not work, it's in the Files > Presentations section)
The slides are in English, the talk is also available on Youtube, but only in Dutch ()
I hope to re-record that in English some day.
And yes, please DO install Nanovna Saver, it makes things so much better than fiddling on that little screen ...
73,
Luc ON7DQ