Isn't there a special tool for everything!! I just use needle nose pliers and very carefully twist/rotate the connector back and forth before trying to pull it off. Obviously, be careful not to pull on the wire, just the connector. When I put the wires back on, I use a little bit of DiElectric grease and lubricate both the spark plug and the distrib cap connections. This will make it easier to remove the next time around.

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1994 E320 Cabriolet
1992 300CE (Sold)
1991 300SE (Sold)
1986 560SEL (Sold)