Balayage on natural colour?

I’ve been growing my hair out for 2 years now so I can go blonde. I tried to do it on top of the endless black hair dye layers and of course it was a mess, damaged and had to cut it all off. Now my hair is finally “virgin” again, I managed to get rid of all the dye as I kept trimming it and I’m having my hairdress appointment this week. Do you think they’ll be able to do it in one go as it’s on my natural hair colour? I have medium brown hair and the colour I’m aiming for is either a greyish/ashy blonde balayage or icey blonde balayage

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