Put on the jeans and stand in front of a mirror
Decide how much length you want to shorten
Fold the hem up once to the desired height
Smooth the fold flat around the leg
Fold again if you want a thicker cuff
Match the cuff height on both legs
Adjust the cuffs so they sit evenly
Tuck in any loose fabric if needed
Check the fit with your shoes on
Re-fold until the cuffs look balanced