Don't overthink this.  Ride it around a while and get used to it.  Don't try to get in trouble, but try different road and trail surfaces.  Learn what you can see in the mirror(s).  Find how you can best overcome the limited lines of vision from the low vantage point on the trike.  If you are enjoying the rides, the miles will go by, and you will find little things that bother you, which you can get advice about here or at the dealer.  If you don't enjoy the rides, well, we can at least try to help you find out why.