A lot of people can't close the back cover of a Casio watch. In fact, in 95% of cases it is impossible to manually close the back cover of a Casio watch. There is a special press for this. I have been using one of these for over 5 years. I recently released a video about it on my YouTube channel.
You can learn from me on your own: change batteries, shorten bracelets, and make minor repairs on different models of watches. And also to find out what difficulties a watchmaker may face during a sim...