What toner should I use?

i have medium/light blonde hair and my hairdresser used a light brown very ashy toner on my hair. This is a complimentary tone to my skin and as my hair is damaged it matched my roots well, allowing me to not have to highlight my hair. However, this service is quite pricey and the toner washes out quite fast. I... show more i have medium/light blonde hair and my hairdresser used a light brown very ashy toner on my hair. This is a complimentary tone to my skin and as my hair is damaged it matched my roots well, allowing me to not have to highlight my hair. However, this service is quite pricey and the toner washes out quite fast. I have a 'sallys (uk version)' in my town, and I know my hairdresser used a Wella product. How could i go about doing this at home in terms of what shade to by/how to use. Thanks
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