I have naturally dark brown hair that can go a bit reddish in the sun. I also have quite a few greys and regularly use a dark brown dye. I'm getting fed up and really like the idea of caramel or dark gold highlights but would this work, or will I end up with lots of orange streaks? Problem is. I really can't afford a professional colourist so it would have to be a DIY job. Can anyone please advise?