Aye, everything on it rolls- I tested this theory on my first run- though tbh some of it is easier to drop/jump! (there’s a couple of bits where you’re arguably not riding the trail if you take the easy line, like hip replacement frinstance)
I’d call myself an average, maybe a little above average rider… certainly not great, nor brave. My first full run down it was a bit sphincter twitching and also included a nice rest halfway down to let my arms recover. As downhill trails go, tbh it’s not that hard though some of it is intimidating, and it’s physically demanding. I reckon Golspie’s black is technically harder, frinstance.
What I’d suggest is, do the red a few times, check it out from the lifts- you can see most of the harder parts- and then just see how you feel. I love the red, absolutely love it, but I don’t think I could do 2 full days on it without getting a bit bored.
Oh and the waymarked 10 Under the Ben route sucks balls frankly- there’s some excellent riding on it but you can fold it into a lap of the witches trails. Which IMO are great- maybe too much nasty climbing but the descents have a bit of class and character that most red routes lack.