OK so I had gotten my hair proffesionally done, I originally have dark brown hair and I had gotten it dyed light brown with highlights and it looked amazing but than of course my roots came in dark so I wanted to dye my whole head a chocolate brown... I used an ash brown it is for dark hair that want to go medium brown:

RESULTS: the roots are a chocolately light brown not bad but the roots look blueish gray!! I have long hair and my roots are light half way down my head

WHAT I WANT>> my whole head to be chocolate brown! And I'm sooo scared of getting red hair if I do it myelf.. please give advice if you have experience or are a professional thank you

It turned bluish because you used ash. Big no no. You need to add a filler. Find out what the color on your head is. So lets just say the darkest strand is a 6. Then I would use a 5 to cover all of it and even it out. BUT, make sure you find a color with warmth in it. And since you don't want red in it I would go to a professional and have them look at it, then they can determine what color you can use. And since you are not in my chair I don't know what your hair looks like. If you had it done originally and you liked it, then why didn't you go back to the same stylist to change it up for you?

I didn't think this would happen lol, I heard if you use ash it wouldn't turn red but than if you use ash it turned it blueish gray... well my hair isn't that bad I mean it could be worse it almost look brown but in the bright light its blonde highlight gone wrong haha thanks

No problem, again because you aren't in my chair, it's hard for me to judge on what I would use.