Sounds to me that you're capable of doing it yourself. It is not too difficult. Buy the flex disc fromparts shop as well as the MB Service manual from parts shop. You have got to get to the clamping nut on the driveshaft to gain enough clearance to get the flex disc out. There is a centering sleeve in the driveshaft that fits over a centering stub on the transmission flange that must be cleared in order to remove the driveshaft. lossing the clamping nut and slide the front section of the driveshaft back.
One the other hand you may want to completely remove the driveshaft to replace the center bearing anyway with 164k on the clock.
1990 190E 2.6
1996 Grand Voyager 3.3
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1982 Suzuki GS 750T