I did it, I had a time of it...but I did it.
I did fret a bit, as the color changed to DARK, very dark and I was afraid this was not a medium blonde. Well, it is much darker than I expected, the older highlights do come through in the sunlight....and I know it will fade a bit with washings and sunshine. All and all, I am happy with the results and I am thrilled with the money saved. So for now, I will be my own colorist~