It's a gorgeous colour! Go with a colour stripper, and if it's still not light enough then bleach bath - you want to get an orange-gold undercoat. Then I'd do a level 7 ash gloss colour like dia light (ash tone will counteract some orange from the undercoat). Then I'd go in with balayage and bleach 6% to get the really soft highlights, then tone with something like 9.01 dia light x