I've seen enough people bend or break brand new gear, the below guide is a technique I use myself after hearing what people did wrong while changing theirs and countless changes on my own gear. Please, please, please take your time and caution when removing knobs.
So things to take note of....
- Only pull straight up, don't twist or wiggle the knob while pulling. (I find it easiest to put the controller on the ground and pull directly towards me)
- You dont want to damage your existing knobs, the best way to do this is with a small piece of cardboard about a 1 inch square (I use the top of a cereal box as it flexible enough to bend around the knob.
- You can't grip it with your hands don't be afraid to use a pair of Grips, pliers, etc. Here's where the Cardboard you got in #2 will come in handy.
Lay the controller on the ground, lay the cardboard over the knob, Grab the knob with pliers, pull right off, Line up and replace knob, Enjoy!