If my memory serves me correctly I once installed a set of ball joints in a Gm car in the following manner. (I believe they are similar to the MB type) I put the ball joint through the control arm, placed a piece of about 2 or 3 inch pipe over the top of the ball joint with the bottom of the pipe resting onthe control arm. The top threaded part of the ball joint stuck up through the pipe. I then put some stought washers over the threaded part and resting onthe top of the pipe. I then put a nut on the ball joint and as I tightened it down on the washers resting on the pipe it pulled the ball joint into the control arm.
I believe I had removed the old ones by putting this same piece of pipe over the bottom of the ball joint and then took two pieces of angle iron with holes drilled to accept a couple of pieces of threaded rod and tightened them down with one piece of angle on the bottom of the piece of pipe and the other resting on top of the ball joint. As I tightened the threaded rods the ball joint was pushed down into the piece of pipe.
Cheap, easy and effective as I recall.