Usually I just pull them out one by one slowly. But then recently I heard that some people cuts away the strings quickly to avoid the unbalanced tension breaking the racket and so I tried it out once. When I cut the strings on my MP100, I string my racket at 24 lbs btw, I felt lots of shock vibration as each string snaps. I don't think this is good at all because the shock vibrations could probably do some unseen damage. But if what I've heard is true, then I'm confused as to which way is better. What do everyone of you think?