Sup RVGeeks,
I went all in with mine - my buttons (especially the power button) sucked.
Follow that video to get the controller open. Disregard the Wifi card mumbo jumbo.
Of note, my controller would not fully open, as some of the small wires had bee routed around the left gimbal (stick) and had some glue dabbed to keep them in place, this held the controller together a bit. I eventually removed the glue with hobby knife to access the innards more freely.
So yes, remove the board form the controller - keep track of screws and where all the wires go. Take pictures with your phone as you go, this is a good way to remember what plugs in where. It's not that complicated, but this will eliminate any doubt. You'll have to remove some screws to remove a component around the power barrel connector too.
Once the board has been removed, you find that there are plastic buttons under the face of the controller that, when depressed, press a small switch on the board. I could not remove these buttons, as they were on there pretty good. I simply pushed them out of the way (just like when you push them from the front of the controller, just much further) and went to town with some sand paper. As the buttons were not completely out of the way, the got kinda scuffed up too - small price to pay. After sanding, everything was like butter - no friction, no binding in any of my buttons.
Take it slow, don't over tighten any screws, and be very ginger with those cables. Remember to pull on connectors, not wires. Use a small flat head or pliers to pry/pull them up if need be.
Good luck.