Having a bad trip is definitely a possibility, but it's not something that's very predictable, as the entire experience is completely foreign. You can significantly reduce the chance of a bad trip by putting yourself in a comfortable and safe environment, however.
Also, I've found "bad" trips to be just as valuable psychologically as "good" ones, though they can seem life threatening in the moment.
Also, I've found "bad" trips to be just as valuable psychologically as "good" ones, though they can seem life threatening in the moment.