After you have removed the bolts from the bottom of the panel you will need to pull it out then lift up on the entire panel. Once removed you will still need to remove the rail that is riveted to the tub. I used a grinder to remove by rivets, I just could not get a drill bit to get a good enough bite on it without it wondering. Be forewarned the rivet holes are rather high on the tub and your rocker guards may not cover them. Mine fell about ╝ of an inch short from covering them.
Here is a pic of mine from when i test fit them.