[organicfigs]

I'm not sure if they have a session prior to competing but I know they use it to train and get through 8+ hours of practice.

[hypnqs]

It's not every day you hear a strong a testimonial for hypnosis :)

Can I hire a hypnotist or something to try this on me, or is there a book which describes the process?

I imagine it's something like getting into a flow state on command & staying there.

[mindsetalex]

I'd look into active-alert hypnosis: https://www.tandfonline.com/doi/full/10.1080/00029157.2018.1...

We have an alert session in Mindset you can try as well. The flow comparison is quite apt.

[organicfigs]

I wouldn't know since I haven't really prodded them on the details. I wouldn't want to give any advice on something I don't know too much about, I'm sorry!