I followed the instructions on that thread a few years ago and was able to perform the task in about 15 minutes. You can sure save a ton of money if you are patient and don't mind doing a few tasks yourself...

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car