Well, first of all: have somebody present to monitor you and protect you from possible harm. Iboga is a very powerfull substance...it absolutely dwarfs LSD in every way. Having to vomit heavily on iboga is innevitable when you take visionary doses.

Experiment with smaller doses first.

A small dose only gives a glimpse of what iboga is capable of, but it´s good to find out in advance how sensitive you are.

When you take iboga, you need to prepare realy well. Drink a lot of water the days before, so you´re less likely to suffer from dehydration (from all the puking).

Take a week of. You´ll be unable to function normally for at least two days, but it will take a full week to completely recover.

Watch your diet. No grapefruit´s, no alcohol or medication. No herbal medication like saint johns worth either. Iboga reacts very strongly with other subtstances and often in a very unpredictable way. No ayahuasca or MAOI´s (including herbal MAOI´s) for at least a month after. Noribogaine stays in your body for at least a month and some people are xtremely sensitive for how it interacts with other substances.

Iboga is the mount everest of psychedelic´s as far as i´m concerned: it´s about the highest peak you can reach, and climbing it unprepared is dangerous.