I don't want to beat a dead horse but in some instances it's better to seek the aid of a professional than to save a few dollars and do it at home. Although having a license doesn't make someone an expert, it does increase the chance that you'll get the results you desire. If you're coloring mature Dreadlocks, have damaged hair, have already had a bad dye job or you're lightening your color, it's best to seek professional advice.

Choosing a Colorist...
Have an in-salon consultation. Tell the colorist the results you desire and ask her/him to weigh the pros/cons of choosing that particular shade.

Inquire as to what type of colorant and brand she/he will be using and why. This will help you just in case you change colorists in the future but liked the results of the initial product.

No matter how you sport your 'do, the colorist should inquire about your hair history. If not, volunteer such information like the last time you relaxed, used henna, colored... If she seems uninterested...Be Out!

The colorist should then examine your scalp. Any cuts or abrasions and she should advise you to wait before coloring. If everything seems ok, she should do a patch test the day before your scheduled visit to insure that you won't have any allergic reactions to the product.