Hi, this is Jeremy. I am in the process of practicing this piece now after about 15 years off from offical lessons.

I'm 32 now and don't get time to practice much but when I do, I work on this one. I can play some parts perfect up to speed and some not so much. I think that the key in this particular song is training your fingers if not already done to know the chord structure while just playing on a desktop or some flat surface.
It's odd, I practiced the faster 8 finger chord parts while at my desk. Once you know where your fingers and wrist muscles should be on this powerful piece, you will be able to if you sit right, keep your elbows above the keyboard and have no more wiggle room when you "strike a pose" with your fingers.

I mean that too. Much of this song has to do with very strong hands, wrists and fingers, let alone memory of the structure. Practice it slow without mistakes other than a slow tempo. You'll soon find that you can play out the famous fast lines of this at your desk and your fingers will just bounce to the position they should be in for this and many others like it.

Try it to see what I mean, it's all about wrist, finger and muscle strength in this piece although the nuances are a must too.

It's definitely a workout, I can tell you that but I can pay these chords without a keyboard in front of me and when I move my frozen in time hands to my keyboards next to me, it's a prefect match with the placement on the keys.

Learn to memorize the muscles and exact fingering and don't stray, then see if you can do that without a keyboard in front of you. You should be able to if you know what I mean, your fingers will just snap to the right place and be frozen there.

That's what they need to do for this song since there are many large chords. I hope you have big hands! Cheers....