Dying hair rainbow, (professionally)... should I ...?

I want to get my hair done in rainbow colors. I know they will want to lighten my hair down to like that ugly brassy yellowish color. I am currently a dark brown. Would it be smart to just have my hair done to a blonde color I like then go back a second time to have it dyed the rainbow colors, or have it all done... show more I want to get my hair done in rainbow colors. I know they will want to lighten my hair down to like that ugly brassy yellowish color. I am currently a dark brown. Would it be smart to just have my hair done to a blonde color I like then go back a second time to have it dyed the rainbow colors, or have it all done in one go? What color blonde would hold colors the longest?
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