If you were to pursue this, I highly, highly recommend focusing your practice on catholics seeking sanctification and salvation, not practicing with any other counselors and keeping yourself under the direct care of a spiritual director.
Here is my thinking behind this:
First, you'll find out very quickly that the stated goals of psychological counseling are not the practical goals. In practice, most counselors are looking to keep people coming back for counseling in order to ensure a paycheck and not helping people. They spend a lot of time on self-actualization, which is just a fancy word for pursuing all of your worldly desires and not seeking to save your soul.
Psychology does not comprehend mortification. It only comprehends human nature, so it can only operate within those bounds. As a catholic, you would have an edge on everyone else because you do comprehend self-denial as a path to becoming a better person, with the greater benefit of helping people to grow in sanctity.
So far as my own studies have taken me, I have not found anything in the science of psychology which works in opposition to catholic teaching. However, popular theories like feminism and sexual freedom which are becoming popular to propagate in the fields of counseling are so popular because they keep people coming back for more by making them miserable. I despise this tactic and I have no respect whatsoever for psychologists who adapt popular social standards as psychological and scientific fact. It does nothing but make people unhappy and it drives them to misery and despair. Which of course, keeps them in counseling. If you endeavor to avoid adapting popular social theories, and stick to the goals of catholic life, you'll be successful because you'll be helping people to live in reality.
Of course, I advise keeping yourself firmly under the care of a good spiritual director because it is so easy to be mislead by what's popular in psychology now. You open yourself up to a lot of information contrary to tradition and doctrine, so you'll need a safe haven and someone to help you to keep it all in a catholic perspective. My personal reason for recommending this is because it took many years of untangling all of the misinformation and lies to get my mind right with Catholicism, and I'm nowhere near finished undoing the damage, so tread carefully.