Although I follow all the fundamental procedures, I find it sometimes difficult to get the muffins out of the pan without destroying them or scratching the pan.
I found an easy solution for this.
All you need is a medium size plastic cup which has approximately the diameter of a muffin.
Cut off the bottom, cut down the side from top to bottom and round the edges.
Slide the cup between muffin and pan and rotate it gently.
Once you feel it getting loose you can pull it out.