According to [guide|135260|this iFixit guide]it’s only 12 steps and takes up to 50 minutes to do. After a brief look through doesn’t seem too complicated but just needs a steady pair of hands.
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Apologies as that was the guide for the incorrect device, and it appears as the other commenter said, the battery in this watch is much harder and much much more complicated to replace. I can’t even seem to find any videos online after a long 10 minutes of searching.
According to [guide|135260|this iFixit guide] it’s only 12 steps and takes up to 50 minutes to do. After a brief look through doesn’t seem too complicated but just needs a steady pair of hands.