You can beat 80% of the competition just by showing up.
Many people may listen, but few people actually hear.
Leadership does not mean getting people to do their job. It means getting people to do their best.
Life isn't fair. It's true, and you still have to deal with it. Whining about it rarely levels the playing field, but learning to rise above it is the ultimate reward.
I know that you don't know, but you don't know that you don't know.
Just because an employee does things differently doesn't mean he or she won't do the job right or as well. If you establish expectations of the goal and the standards to follow, then methodology shouldn't be an issue.