Tip: You do not need to remove the battery to swap or repair the motherboard. I prefer not to use a heatgun and pry against adhesives unless absolutely necessary.
I just used this guide to quickly get at the motherboard to replace a faulty power button. It's tedious but not impossible with a very clean soldering iron tip, solder wick, and lots of flux. The replacement button and covers from iFixit were an exact match (I checked under a microscope).