All you really need is the 27mm socket, torque wrench, a 17mm open end, pair of 8mm wrenches to take loose the line clamp, and maybe some new cloth fuel return hose. Loosen the line ends , then take the clamps off then remove the steel line. Remove the return lines from the injector. Remove the injector with the big socket. Remove the heat shield (the funny little washer below the injector-note which way it was put in). Install the new injector and use a new heat shield-you remember which way it goes-right? Torque the injector to 70-80 nm. Redo the steel line. I like to tighten both ends, then back off the injector end one flat. Put the cloth covered return lines back on. Sometimes you can just cut off the last 10mm of the line and push it back on the injector, sometimes you just have to replace the line. They can leak pretty easy (that isn't the real source of the leak is it?). Reclamp the steel line. Have soemone start the car and as soon as fuel starts to come out of the slightly loose nut at the injector, tighten it down the rest of the way. I like to do it this way to get the air out of the lines in hurry. Officially, the line nuts should be torqued down to 25 nm with the proper tool and a torque wrench, but I have yet to have a problem this way.
Now if we could just set the timing as easily with a dial indicator on the Benz as I can on a vw diesel.