Thank you very much for the how-to! The difficulty mostly comes from the time required to change the battery. The actual steps are all easy except for the glue-related parts. Softening the glue took some time and I had to trust myself to use a bit of force when removing the battery. The most annoying part was removing the residual glue from the aluminium case. Otherwise a very simple process, just be sure to take breaks just before starting the degluing process!