45 using a 3 gun shooter isn't bad at all, especially for your first time.
A couple of years back my son and I shot a course on a Monday, it was the first time for us on that course. We struggled horribly and when we got to the 8th station one of the range masters came by and asked how we were doing. We told him we were having a tough time getting 30%. He said "yeah, the pros that shot here this weekend said it was tough too. We haven't reset the course back to normal yet..."