I had to do some of this today. I am enjoying the pleasure of dropping my trans out, so first one drains it.

1. Mine uses a 5mm allen. I suspect yours will too.
2. Turn the motor at the crank pulley clockwise only (to be safe) with a socket that fits the pulley bolt. I say clockwise only as it is verboten to turn a Benz V8 (probably applies to sixes and fours too) counterclockwise.
It helps to have someone watching the converter for the drain to come around while you do this although I managed without.
3. Haven't gotten that far yet.

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Fourings

84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting.
1992 Anthracite 400E, 161k, "Grey Ghost".
1986 VW Quantum Syncro, 192k, gone to the crusher in the sky.
1989 300TE 172k. (Was mine, now also Mom's car)
72 280SE 4.5 (Mom's car)