I just did one on my 300E 2.6 last week.
I was suprised how easy it was. The only thing you need try to do is put the bottom hose on before sliding the new one in. I did not and still managed to tighten the connector up using a small spanner. I also replaced all hoses at the same time, used MB antifreeze and Dextron III for the transmission top up.
I have a procedure from the Haynes 124 manual if you need it. Let me know and I will scan it in and email it to you.
I got all parts from Fastlane and paid for the overnight delivery. Excellent service.
1990 124, 300E 2.6 (daughter)
2004 Cayenne S, Fabspeed Cat Bypass, BMC Racing Filter
2000 Lexus RX 300 (Wife)
Retired 1999 ML430