VIR is challenging IMO. It is not challenging to learn the first time, but it is very challenging to master it. And since it is a long track with at least 17 turns (depending on how you count), making mistakes in any one of the turns is almost a given. Some turns are not forgiving, such as T5 thru 6a or the uphill S section, or the T9 (South Bend), so caution is the key. At the same time, it has the combination of tight turns, wide turns, increasing/decreasing turns and two long straights that you reach 150-160 mph, so it the most fun track I have been to, not that I have driven many different tracks.
Looking forward to seeing/meeting you there. I am sure you have seen many videos of the track, it will help to study them before stepping onto the track the first time