do the roots yourself?
I went to my hairdresser for the initial transition from (dyed) dark brown to blonde, and have gone back every 5-6 weeks to have the roots bleached
I know what strength peroxide they use and how long to leave it on for (and I'd do a strand test first) pretty sure I could do it myself.
Partly to save money but also just to save the hassle of going to the hairdressers.
Or is that just a bad idea?