Measure and cut the jeans to your desired length.
Measure and mark where you want the ombré affect to start, then apply the bleach under where you have marked. I have used Sellotape as a guid but you could use a marker.
Use the toothbrush to rub in the bleach, do the same to the back of the jeans as well.
Remove the Sellotape, then blend out any harsh lines with the toothbrush.
Leave them for 30-1hr. Keep checking until desired colour is achieved, when it is put them in the washing machine.
When the wash is finished, trim off any unwanted threads.
I have rolled the bottom of mine up, but you can create the distressed look at the bottom by pulling the threats with tweezers.