Wanting these ends on a bob that stops around or below my chin or collar bone. I want really spikey ends, hopefully with a straight line in the space between them. Literally like this picture.

Can I simply cut it this way? Do I have to use product? Can I recreate it post-haircut by simply brushing my hair? If I can’t just brush it out back into this post-haircut, and I must use product, what do I use and how?