There should be some threads on you situation.

Most of the ways I have read are to Heat the Area with a Propane Torch and a Breaker Bar with a long Pipe on it.

Some have arranged it so that a Jack pushes up on the Pipe/breaker Bar and one person Jacked the Car up and arranged the Pipe/Breaker Bar so that when the let the Car Down the wight of the Car applied pressure on the Pipe/Bar.

If you have been using a big Allen Wrench and want to get a socket on it you go to the Hardwars Store and ge a Rod Coupling Nut/Coupling Nut. I believe the size you need takes a 9/16" (14mm) wrench on it.

What ever bit of grease stays on the Boot will hot hurt anything if it mixes with the Axle Oil you put in..

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84 300D, 82 Volvo 244Gl Diesel