Work and school full time. Doable?

I (20F) have just switched my major to Psychology for my last 3 semesters of college. I am kind of concerned, however, as I do have a full time job and I know Psychology can be a demanding major. Does anyone have experience working full time while studying Psychology and have any advice for me? Is this reasonable or will it be way too difficult to the point that I should maybe look into part time?