The harmonic balancer bolt requires a 27mm socket. You'll need your breaker bar and extension (or air impact gun). The real difficulty is keeping the engine from rotating while unbolting. I think you'll need to find some way to keep the flywheel from rotating while doing this, unless you're successful with an air impact gun. I'm not sure what tools are needed for a M-B after that... harmonic balancer puller?
95 E320 Cabriolet, 131K