Tip 1 - What type of coloring job?
Hair styles hair color & hair highlights - Permanent coloring will dye your hair so it will not wash out at all for a very long time. However this will leave your roots showing when they grow out which you need to be aware of and can really look bad later on.
Hair Ideas & Haircuts for Women - Semi-permanent coloring will only darken your hair and cannot lighten it. It also lasts a variable length of time depending on the product. This is more suitable for a home color job but obviously has limitations. It can however be reversed easily unlike a permanent coloring!
Tip 2 - Know your hair color!
There are 10 Base Colors in the realm of hair. This is the color you can judge by just looking at it, when you color your hair you will lighten or darken by one or more degrees based on this scale.