I have a gentle slope on my driveway, so I can just put it in 3rd or 4th gear and gently pull the car towards me to get the engine to turn over, then stop it when the lobes are in the correct position for a particular cylinder, and use the emergency brake to keep it there. I make the adjustments, then pull it towards the next cylinder. The firing order is cast into the valve cover (Zuendfolge) so you can just go from cylinder to cylinder in that order. My driveway is pretty long and I have two teenage boys to help me push it back if I have to, but I can make adjustments then check each one after going through a couple of complete engine cyclings in a car length or so. In other locations I turn the engine with the 27mm wrench on the crank pulley fastener, or I use the power steering pulley fastener. I lean towards the power steering pulley fastener these days since it is so accessible.

Good luck, you have lots of choices that all work. Jim

__________________
Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)