I was about to agree with the second person who answered and then realized it was me haha! Not difficult to switch, into engineering, see the response I just posted to this question: http://talk.collegeconfidential.com/rice-university/1791066-chances-for-ed-will-chance-back-thanks-in-advance.html
People often straddle different distribution areas (Rice lingo for STEM vs arts/humanities vs social sciences) before declaring. My roommate definitely did!