I know a number of young people who have done this in recent years. In most cases, they loved their time abroad and went on to make a smooth adjustment when they arrived on campus second semester. In a few of those cases, the semester abroad set a foundation for their academic and career interests. In a couple of cases, things didn't work out as well, but not disastrously either. Both of those students transferred to other schools where they were quite happy and successful. It's possible that would have happened anyway, even if they had been on campus first semester.