Place the watch back opening tool into the indentation and use leverage to open the back case. Note! Some are stuck on the pretty hard, but if you feel like you're using too much force, you probably are!

Do not use the back opening tool other places than the indentation, because that will likely create scratches and not work well!

Having successfully opened the back cover, pull the crown (marked with red in picture 2) out one click, but not using force!

Locate the small pin / lever identified by the red mark in picture 3, and using a watch tool or a thin tweezers apply gentle pressure downwards whilst carefully pulling the crown all the way out.