
If you are frustrated by your hair dresser's lack of any sense of geometry consider getting a Flowbee which enables you to quickly cut your own hair with a precision that cannot be accomplished any other way and which collects the hair straight into the vaccum cleaner so there is no mess. Its construction reeks of cheapness but it works well.
Nature knows what it is doing in the beauty arena and has given each woman the perfect hair color for maximum beauty and attractiveness. There is no need to change it except for perhaps boredom. In the case of boredom it might be better to get a hobby or pursue a new business rather than changing hair color.
Shampoo is overrated. It is mostly unessary. If you find a good finishing rinse and use a large amount of that on your hair, then rinse thoroughly, especially the areas just above the neck and just forward and up from the temples your hair will be squeaky-clean but will never be dry or tangly and will be naturally manageable without too much, if any, additional product.
Once in a while, of course, you will want to shampoo. Its fun. But the importance is far overstated and indeed it is harmful to hair.