The most important thing to do is backup your data to an external drive. Unless you are planning on dual booting (much more complicated) you will be wiping out the entire drive that has windows on it when you install Linux.
This guide goes through the whole installation process.
His excuse seems to be that anyone could have called the police on the Burger King employees for giving someone the wrong order, to which I would say:
B. Do you think that deputies would have rushed across town to deal with just any random crank, angry at a Burger King?