If a chord is difficult what I do is rotate a chord change.
F is difficult for nearly everyone in the beginning as is (the worst open chord in the world) B7.
What I did was going from A to F back to A to F slowly building up speed but starting very slow to get it right rather than fast.
B7 - E switch will become helpfull as well (only need A to get the blues).
Anyway, like all say, go slow, is really true.
• "Great spirits have always found violent opposition from mediocrities. The latter cannot understand it when a man does not thoughtlessly submit to hereditary prejudices but honestly and courageously uses his intelligence."
• "Do not worry about your difficulties in Mathematics. I can assure you mine are still greater."
• "Do not worry about your difficulties in Mathematics. I can assure you mine are still greater."