As mentioned, it’s not difficult. However, you have to be aware that sometimes inserts don’t fit quite nicely band snug. Some fit too loose, which in that case will need to be glued to the bezel. While others will be too tight and won’t easily slip into the bezel, which will need enlarging with special tools.
Believe me, I’ve been in both predicaments, not the end of the world but not straight forward either.
Good luck.
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