How hard will it be to get black dye out?

I accidentally dyed my hair black; it was supposed to be dark brown, which my hair naturally is. How difficult will it be (and I'm definitely going to a salon this time) and how painful on my scalp will it be to get it back to dark brown? I'm not looking for it to be really lightened, just definitely back to brown.

I would recommend that you check with your particular hair stylist. I don't know the type of hair you have or your skin type and whether you may have allergies and etc.
I do know that there is a recommended waiting time between each time you get your hair dyed because repeated and excessive use of those types of chemicals on your hair can dry it out and/or damage it.
But all in all make sure you check with your hair stylist!

wash your hair and wait a little bit and your hair will get lighter

It depends if it's permanent or semi-permanent. If its semi, then it should wash out after 6 weeks or so, if it's permanent, then I think you can get the colour stripped out to your natural hair colour if you go to the salon, but I've heard it's a bit pricey.
As for your scalp, depends if your scalp is sensitive and such. I'm sure you will be fine!
Then again, you might suit the black

If you dont want to go to a salon to get it done (which I highly suggest you do) then you are going to need a hair stripper. What it, as I'm sure you can imagine, it strips down the colour and you can apply as much as you like until the colour is back to the colour you wanted.
There is always a catch and here it is ... With your stripper it can do a lot of damage to your hair ... Not only that but black has red in the undertone colouring and that could show up if your not careful
So in closing, I suggest you go to a salon. But if you think you can do it go for it =]

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