I have mentioned elsewhere that most "instructional" videos on Youtube make me cringe at the work-practices and technical explanations given. Absolutely normal precautions, used happily in every workplace or home, for handling hobby materials (whether photo-chemicals or other household products) are frequently ignored.

With appropriate minimal equipment and technique one does not come in to skin contact with photo chemicals and with reasonable ventilation for colour materials there is no problem there either. Repeatedly ignoring being sensible and prudent gives one entry to the Darwin Awards, but one would have to try very, very hard indeed to 'win' anything using only normal photographic supplies.