I couldn't take it anymore; the nasty old door handles had to go.
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Parts & Materials used in this video:

/ BMW F10 interior door handle set: https://amzn.to/3HSASYq
/ Torx bit set (includes T20 & T30): https://amzn.to/3Ua17MD
/ Flat head screwdriver set (includes small): https://amzn.to/3GNv5TJ
/ Interior trim removal tool set: https://amzn.to/3u2Ptsj

2011 BMW 535i 520i 523i 528i 550i 528xi 550xi 535xi 535d 518d 520d 525d 530d M550d M5 2012 2013 2014 2015 2016