Mouthguard, yes. But lose your shitty Tae Kwon Do kicking partner, he's out of control & a danger to you. MUCH better to roll with Blue Belts or above. They may crush you, but shouldn't hurt you.
This all the way. We have a fair amount of wrestling/combatives guys from the army base that show up and it always is a process to get them to understand that there is a time and place for smash and grab. Myself and a few other “unassuming” looking folks are the go to for the professor to teach a lesson when the goons don’t get the hint. After that they are normally much more apt to listen.
As a hobbyist, treat yourself right. This shit is awesome but it isn’t your lifeblood.