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Mostly okay. Our roads are still in miles per hour, and we still sell a "pint."

But at least food labels are all metric.

http://en.wikipedia.org/wiki/Metrication#United_Kingdom

Would indicate that the process has being going on for some 40 years and is still not at all complete. That to me indicates that it's not "easy" either.

Then look at one of the many other countries that have completed it: http://en.wikipedia.org/wiki/Metrication#Chronology_and_stat...

They still haven't converted. Miles & Miles per hour are still used for driving.