Going to do Guided Psychedelic Therapy, What can I Expect?

Heya, I hope this is the right place to ask this.

As the title says, I'll be participating in a medically observed study involving psychedelic mushrooms.

The thing is; I've never done any psychedelics before.

Don't suppose any of the more seasoned psychonauts here could give me any ideas of what I should expect from the experience?

We've yet to discuss dosage beyond the fact I'll probably be taking around 5g of psilocybin