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I wish I knew at the time that a good amount of pressure should come from pulling back at the shoulder of the fretting arm, bracing the guitar body with your strumming arm chicken wing. You can practice this by fretting the F without your thumb on the back.
Also, you could try to play the A barre chord at the 5th fret with the same shape as the F barre on the first fret. Will help build some strength
The difference is that sit in’s were directly related to what they were protesting against.