Even as a full-time college student, I've used a professional, and I'm glad I did. He did things as straightforward as claiming relevant education credits to more esoteric such as maximizing refunds around housing stipends for summer internships. I didn't have to do much else other than reach out to my accountant and provide a W2.
It's fully within the bounds of tax law, something which I (and my accountant) made very clear I want to stay within. Our tax code is a joke, yes, and in need of actual reform, but this itself doesn't put me in any legal grey area whatsoever.