u/Ashamed-Push-532

If the racket head is above chest and I have to change from backhand to forehand grip so that the racket face is flat should I try to rotate the racket 180 degrees with index finger and thumb or only 90 degrees and for the rest rotate my forearm and when changing grips should any part of my palm be touching the racket to stabilize it other than my index finger and thumb. Also you can share any tips for changing grips.