What do you think it means to "take matters into your own hands?"

It could mean seek justice on your own, that you're dissatisfied with the way someone else is trying to handle something or that they aren't trying at all.

themindbogg I think it means you take a situation on and try and resolve it yourself

uh. context is everything, but do it your ownself.

Do it yourself so you don't need to rely on others.

DIY