You don't need much training to be a petsmart groomer. I was offered a job from them when I was in my first few years of college. The training is only a few weeks. But they told me up front that they wanted to know if I was going to be with them for at least two years b/c since they pay for the training, they want it to be worth their money. I was going to be out of school in less than two years so that did not seem like a good choice for me.
I guess they are like hairdressers. After you get out of school you go work at Supercuts or Fantastic Sams, and once you have more experience you go to a better place. That's why it's always hard to get a good groom at petsmart, for the most part they are newbies, or if they're not, they're just not that good.
Really, people, it's not hard. Uni's never been to the groomers. i do her myself, everyone always comments on how good she looks.