I've been self coloring my hair at home for 8 years (yay early graying! Lol).

I've been using product from Sally's, and have always dyed it one color.

I've been thinking of switching from a vibrant red to black with blue bangs. Mainly because the red is hard to keep, and it's getting cold, and I'm not sure how much longer I can wash my hair in freezing cold water lol.

Thing is, I don't know how to separate the bangs from the rest of my hair to color it differently without them touching and possibly getting the wrong hair color in the wrong place.

And advice would be appreciated! Thanks in advance!

Also, some pics I found for reference :)

How can I do this at home? https://imgur.com/a/911Kuvy