Generally, it is easy to be accepted into a particular major (with the exception of Physical Therapy & related majors that have a different selection process...). I think the biggest challenge for me was figuring out what I wanted to do. Once I decided, it became very easy and many people are happy to help you if you are having an issue with your major. The best advice I could give if you're having trouble in your major or you think you might want to change majors would be to talk to your advisors and professors. They are the best resource you can have on campus, and most of them are happy to help if you ask!