Advice on dying dreads from brown to blonde.
Dreadlock Styles and Dread Styling
If you do bleach and decide to do so at home, research first, check out what the active ingredients are and how they work and pick your product based on that.
Also, don't go for the whole thing. Do not bleach your whole head, heck don't even bleach whole locks.
Do some tips, (like frosting!) as a test, to see how your hair tolerates the treatment.
Also, so you don't get the sharp colour transition between bleached and roots.
All in all, the less you do the better your locks will be for it.
I'm not one to tell you "not" to do it as I do dye my hair myself.
I've a mousy brown colour that's fast turning gray and I dye blue.