I MAY be able to answer some points.
1. Single pin rear pads. Knock the pin out, remove old pads, insert new pads,re-install pin, done.
2. Front pads. No " tricks " involved. Remove caliper bolts, remove wear sensor, remove pads, install new wear sensor ( $ 2.00 per wheel, ), install new pads.
" Miller Time " .
P.S. Just noticed, unlike my C 230 K, YOU seem to have rear wear sensors, so apply that part of step 2 at the rear.
You don't have to go to ceramic to get low-dust pads.