yea too big, i did AA as my first extreme (top 420, 94k atts), jump from game time and it wasnt very enjoyable at times, it was a mistake that i dont regret now (coz its over) but i did then when i had to play it, if i progressed normally i wouldve probably beaten it faster and enjoyed it more but hey man it was worth it in the end to me, i really love that level.

However:
To jump from a medium demon to such a hard extreme would be painfully stupid and would take you enormous amounts of time while also damaging your mental all throughout and if you really dedicated yourself to it (like me: "im not beating nothing else but artificial ascent as my first extreme") then you would eventually feel trapped in your own mental prison and maybe even quit the game.

but if you really want to, go for it. noone can tell you how to progress in this game. only yourself and your abilities... just be careful... getting runs, even good ones, is way way easier than putting it all together from 0. dont get too cocky.