Extraction isn't dangerous in the sense that a person who did bad in chemistry might add the wrong thing at the wrong time and cause an explosion, or create a poison gas, other than the solvent itself. That's not the case. Solvents do not react with based water, or plant material. There is no risk of "bad chemistry" causing some kind of unexpected reaction. One does have to not ignite their solvent with a flame.... just as they have to not light anything flammable. And one has to be careful not to touch lye water, or get it in their eye (lye added to water might bubble fiercly and creates a lot of heat. Add it slowly). And you have to make sure your container doesn't break, which will cause a leak of solvent. The risks are: burns from base water, solvent inhalation, solvent spill, ignition of solvent.
However, a real, and common danger of doing extractions is to your rugs! Based mimoss stains bad, and permanent, and solvent might bleach a rug, and stink it up.
But, I belive that extracting dmt can be done without the use of solvents. Soon I will experiment with some mimosa. I believe that if as much tannins as possible are filtered out or allowed to settle out of mimsoa tea, dmt will crash out when sodium carbonate is added, and allowed to sit in the cold. We know it works with pure dmt in regular water, it should work for mimosa tea.... but for some reason people who have tried it claim this doesn't work. I hope to be the first to succeed in a solvent free extraction. Too bad it may not be relevant for very long, considering that this stuff seems to be becoming more illegal as time goes on.