Well. Let's see. You never do this alone with any of these people, for one. You have someone with you who you trust to-- To not let them hurt you.

We do it outside, away from heavily populated areas. An old parking-lot or a remote part of a park, maybe--not in anyone's apartment building--but still somewhere an ambulance crew could arrive to quickly.

Anything dangerous or inherently harmful has to first be tested on an inanimate object... I don't know, maybe a piece of fruit or stuffed toy. You allow me to bring a fire blanket and any medical non-magical supplies I'd like and you consent to me using them on you if needs must.

At least one of our phones has to stay on, charged, with that location feature thing enabled, just in case we must call emergency.

If someone tries to use their powers maliciously, we leave.