I have light brown hair and I want to go medium blonde. Should I do all-over color or start with highlights?

start with highlightsI have light brown hair and I want to go medium blonde. Should I do all-over color or start with highlights?
you could maybe test on an inconspicuous piece of hair like underneath a layer or two. then decide based on that. I generally just go for it! probably why i've ended up having to bleech my hair twice in the last 6 months... purple - bleech - bright red - bleeeeeech, now i'm growing it out lol