If you follow the advice of MBZ, you don't need to remove the block plug or disconnect heater hoses: Open heater controls to full heat, drain the system at the radiator drain, remove the thermostat, close up the thermostat housing (2 o-rings to make a good seal during flushing), close the rad drain and fill the system. Let it get to op temp or close to it (about 2500 RPM) - this takes time as the thermostat is out - and continue running for 10 minutes. Drain, refill with engine running, and repeat the process. When finished, replace the thermostat with a new O-ring and fill system.

Burping is done by parking the car nose-high and removing rad cap.

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