#1
Ive noticed how many bands have many songs they play live, yet some are in different tunings. How do they tune down/up without manually tuning? Because they never mess with the tuning pegs and it would be too hard for some songs to just move up/down so many frets.
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#2
You have 2 choices. 1 you manuallly turn ur guitar usually using a tuner either onboard guitar tuner or one in your effects loop. 2 you have multiple guitars in multiple tunings. All my bands music is in drop C usually so you wouldnt have to do any tuning but my solo stuff is all acoustic so i just use my onboard tuner on my guitar.
"Men profess to be lovers of music, but for the most part they give no evidence in their opinions and lives that they have heard it." ~Henry David Thoreau