Most of my teenage years were spent either bleached or black lol

I had issues with the bleach simply because of the colour of my hair. The red would always come through and I'd end up straw coloured.

Since you are doing it yourself I would suggest a test patch to make sure you have no major allergies. What is a patch test and how do you do this test?

Otherwise probably try not to do it too often. I found my hair tended to get rather 'crispy'.