It seems that every installation requires different technique/tools. As you have seen sometimes it takes more than one.
Most techs use a technique that requires little in the way of tools. This requires loading the joint and smacking the casting, that holds the tapered pin, sharply with a hammer. Sometimes two hammers from different sides with blows coming simultaneously. The key is to load the joint through jacking technique or otherwise.
BTW if you have arranged a good load be sure to leave the nut on a few threads so that things don't fly apart when it gives.
Bosch Master, ASE Master, L1
33 years MB technician