Vortex 250 pro great bird...! quick and agile, not sure what you mean about LOF, ( line of flight ?) or LOS, Line Of Sight, anyway many pilots say that the only way to learn to fly a racer in FPV, is to use goggles from the outset, flying line of sight will not teach you the depth of field visualisation need for fast FPV flight.
I know its more comforting to fly LOS, but when the bird gets any distance away, you will inevitably loose orientation, then it can be extremely difficult to get the bird back home, because they generally don't hover very well, so you can't easily cut forward velocity and hover around for a while till you get the orientation back again, I know I've tried it and nearly lost the bird twice.
Having said that I know a guy who has flow model aircraft from age 8, he can fly LOS nearly as well as FPV but obviously not through trees where you cant see the bird, but through gates and around flags etc.
I would take the plunge start out with FPV (and definitely use a friend as spotter ), you WILL crash, everyone does, but you will cut the learning time in half, if you start LOS, you still have to learn FPV.
I take it you have flow some kind of quad before,, yes..?