Sorry I know there are a lot of posts on this but I have GOT to get this right cos I did no research last time and my hair ended up a disaster.

About 4-6weeks ago (I forget when), I dyed my dark brown hair red (so it's like a tinted red now, a bit faded) so I have a bit of rootage, maybe 1-2inches tops. I now want to dye my hair with a much brighter more ginger-y red, this colour: http://boots.scene7.com/is/image/Boo...3&op_sharpen=1


I might seem like I'm worrying too much but last time I tried to go blonde from this previous stage and it went seriously BADLY wrong - my question is, should I do the roots for longer with this dye, and for how much longer? If not, what should I do to ensure everything's even?

Should I do a picture perhaps so you can see my roots? I can't really tell the roots from the red but my friend said otherwise.

Thanks a lot!