Actually, on some models you can unbolt the compressor and jockey it around in the engine bay and use the puller in place.

So, how about telling us WHICH model and engine of E320 you are working on?

If you do have to remove the compressor, that means you have to recover the refrigerant (PLEASE don't just vent it to the atmosphere), evacuate the system and then recharge it with the correct amount of oil and refrigant. If you use an indie shop to recover the refrigerant, they may give you a discount on the evacuation and recharging steps, which they'll have to do in any event. Since they get to resell/reuse your recovered refrigerant and know you'll come back for the rest, hence some give you a discount (I've known some that did it for free, which is nice).

And if you have to remove the compressor, then I'm with David: just buy a rebuilt compressor with the new clutch and bearing assembly already in place. The added cost of the recovery, evacuation and recharge makes the cost difference in parts less important.

Good luck.