Hey there 3369,
You will find some of the most amazing people here, they have great experience and even greater hearts. However, as an (almost) complete noob to all this, I would like to add my personal experience so far. I have only done this three times now, the last three weeks. Below are some highlights which have greatly helped me already. And please, anyone correct me on anything, add to this, or anything you see fit. I try to proof read and make sure I have completely written things down, but as a nood I may have forgotten to add something. And always, everyone also has their own opinions and ways of looking at things.
1. Make a tea, with fresh ginger and a little honey. Cut the ginger into small chunks and steep the entire time the mushies are steeping, and make sure you drink ginger chunks. Also, cut some thin slices of ginger and suck on them right after drinking the tea; I even like to have a few more slices periodically just in case/for fun. Just don't chew fresh ginger right away as it is very strong, suck on it first. This GREATLY helped with the stomach issues. In fact yesterday was my largest dose so far, and this helped really made a difference.
2. (SET) At first, try to get him to think of this as more of a show/movie, or even better a shaman or wise woman telling a story which you can see and feel. Seriously here, I am not trying to take away anything from the magic...I truly believe they open your eyes (or I should say your eye?) and mind to reality. They break down the constructs which have been placed to remove us from love, earth, God, and each other. However, we are already living in this reality, you are just seeing it in a different way than you are used to, you are safe. The mushrooms truly guide and teach you, and this teaching/guiding may happen on your first experience or your 30th. But what you really need to do it allow it to be shown to you...good, bad, ugly, beautiful, and watch it all thankfully. This is the important part: They are showing you, and no matter what you see, watch it with amazement, awe, happiness, and thankfulness for this experience.
Yesterday was the largest does I have ever taken (of my three times) and I saw all types of things...but watching as a student with mind open and with thankfulness, nothing of the terrible things bothered me, in fact I was still enjoying it, and the beauty was amazing.
3. (Setting) I was with someone else, it was their third time also. But I truly believe having them there was still crucial for me at that time. It gave me a person to talk to, we explained things to each other, they were an anchor for me and cleared me of any potential anxiety I may have had otherwise. Other than than...my house was cleaned up good enough, I did not have any chores or pressing matters, nothing to stress me at the time. I let go, was comfortable, and had a happy place to be. This is also critical as it allows you to truly experience what is be shown to you, and allows you to focus on it with gratitude and amazement.