Black to Blue Ombre and how to dye your hair yourself

These are some pictures of my black to blue ombre (and at times brown to blue):

This was my first attempt at dying my hair blue. The first time you put blue hair dye on your bleach blonde hair, it will turn green. You need to put blue color on it one more time to get this outcome..

 This color was sky blue by ion color. You can find a tube of this for $5 at sallys beauty supply.

 This was the color when I switched to aqua. I did this to make sure the color stayed vibrant. The more times you re dye the blue, the smarter it is to use a lighter color each time. Otherwise it will turn a very dark blue which is less noticable.

This was my brown to blue ombre before I dyed my hair black. This is my natural color but I keep the roots NOT gray with wella hair dye in the color chesnut. This is also at sallys. 

If you plan on an ombre, it is best to bleach the section of your hair and then put on a color preferably like Ion colors from sallys or manic panic that doesn't require more bleach when you add the color to your hair. 

If you do an ombre like mine, it makes it easier to out your hair in pigtails when you bleach so you can see that both sides will be even. 

What hair tips do you have when dying your hair?