Besides obvious premises (competence, experience, goodwill & sensibility of whoever is coordinating), I would be interested to hear some of your thoughts&opinions regarding vine rituals. Specifically: if you consider more tradition always better or if you think traditional forms to be a base which can/should be evolved/adapted.
Being in a dense tropical forest with a competent caring shaman singing amazing icaros that turn into the ecstatic visions is an unforgetable experience! But I definitely do not agree with any elitism or 'monopoly' over what is the best or right experience, each one will have their path ("there are as many ways to god as there are created souls"). As long as its done with respect and serves for improving one's health and for self-development, it's all good