I removed mine last year and installed a set of zl1 rockers. First and formost, use platic pry tools. Second have extra clips on hand. The chances of removing the rockers without breaking a few or so is very slim. Third patience, patience and more patience when removing. The hardest ones to get loose are below the door hinge area by far. Installing is stupid simple oddly enough. Literally took me less than a minute to install per side. But around 20-30 minutes per side to remove. Below is the link to where I bought my clips. Much cheaper than GM. I went ahead and replaced all of mine just because...and why not? Definitely not planning on removing them again. Do it right the first time and be done for good hopefully.
https://www.clipsandfasteners.com/GM...3-p/a21667.htm