Taking acls refresher as initial course?

I accidentally registered for ACLS refresher course not having taken the course before. When I called to reschedule she said that every now and then people will take the refresher course to get it done in one day. Does anyone have any opinions on taking the 9 hour acls refresher course as my initial ACLS course? Is it going to be ridiculously hard, or can it be done? I'm a last semester RN student with little ECG background but have been studying the course material a lot.