Psychology has 7 pre-major and 10 major courses. Even adding general eds, that’s not many when you have 12 quarters and can select two courses every quarter in first pass. It’s only the second pass classes where it might be harder to find a spot.
Not finishing in four years if possible if you change majors or fail classes, but if you don’t do either of those then with good planning of your required courses you shouldn’t have a problem.