Blue highlights on Baylor box dyed hair✨

Heyyy so i would really like to get some blue chunky highlights and want to do it at home! I’ve been dying my hair black since the beginning of this year but always had darker blond curly hair ✨ does anyone have any recommendations on how to go about this? I do have experience dying or bleaching my friends hair but never my own. Also I would love to know what products you guys would use! (I live in Germany so anything I could get here would be amazing) 🫶