I've home dyed my hair for about the last 6/7 years mainly to cover a few greys. I've dark brown hair with some red in it so go for chestnut red, dark reddish brown colours but they lighten very quickly after a few weeks and I'm left with what I feel is a bit of carroty colour. I've developed some darker roots as have not coloured it since July and I'm not sure what to do with it now. I've never had highlights and wondered whether it's worth trying some for something different. I don't want to go lighter as have dark brows and olive skin. Would highlights show up enough. Hairdressers intimidate me slightly and I don't want to be blinded with hair colour science. Any advice wise people?