1) Why are you replacing the knuckle? it's usually a part that needs replacing due to accident damage.

2) Have a Haynes Manual - or a dedicated workshop manual.

3) You'll need a ball-joint breaker - it's a small expansion clamp that you turn with a socket. There were some large crescent wrench sizes you needed, maybe even some large sockets also, I'm talking 18mm,19mm maybe even 21 or 22mm, I don't recall exactly.

4) You also need to replace the wheel bearing, which uses some specific tools. I remember getting brass punches and bearing packer, these special round discs to knock the bearing race in, Mercedes-Benz bearing grease and bearings.

5) I supported the car on stands, so you need flat top stands and a (two) good garage jack - I lifted the car by the lower control arm and a piece of wood over the garage jack lifting point to protect from scratching - so I could get a jack stand under the sill rubber jack point. I needed to use two garage jacks in order to lift both sides of the car simultaneously.

6) I posted some pics somewhere either on this forum or the Mercedes-Benz Club of America | ( where I post under Scott Singer ) forum of the jack method and locations for lifting, so tomorrow I will try to find them.

7) The shock and spring are not removed, but a jack under the control arm is necessary for support and a few cm's of movement for aligning.

8) Some brake wiring is removed and their associated mountings need to be removed from the knuckle to be installed onto the new knuckle.

I'll try to think of more hints and try to find any old post on the procedure.