I've done the same type of work on w123's with manual and power windows. Your assumptions are correct about loosening and possibly removing the windows. I never took any special precautions for the power windows. Since you said you've done it before, it should be a easy job. Good luck.
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2001 Dodge Ram 2500 Cummins Turbo Diesel - 4x4, auto, 3.54 gears, long bed
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'92 300D 2.5 Turbodiesel - sold
'83 300D Turbodiesel - 4 speed manual/2.88 diff - sold
'87 300D Turbodiesel - sold
'82 300D Turbodiesel - sold
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