One of the things I have done right is this:
From the first song I ever learned in a band, and this goes back to the 60's, I wrote down the lyrics with chords above the changes.
I kept them in a note book. It grew to a dozen notebooks over the next 25 years, plus fake books. When home computers came around, I redid the entire stack into a word processor.
Now there are thousands of songs on my master list (also on laptop, tablet, keyboards and several USB devices for backup).
In MS Word, or Open Office, I can sort them by name, artist, genre, etc., and within seconds have the list in front of me.
Of course most nights, I don't even look at any screen and do everything from memory except off-the-wall requests.
I use the Songbook feature on Korg, Registrations on Yamaha or Ketron and Performances on Roland to scroll through or search, select the next song and have everything ready to go with one button push.
Ain't technology wonderful???