Burnishing - Although it’s tempting to apply heavy pressure in order to drive layers of pigment together, it leaves your drawing with a waxy buildup. Using light pressure instead allows you more control over the amount of wax the blender leaves behind.
The sharper the better - Keeping your blender tip sharpened will naturally make you use less pressure in order to avoid breaking the tip. If you must use heavy pressure, use a worn pencil that allows you to burnish with greater force. Always take caution not to tear the paper.
Color first, then blend - It’s best to lay down all your color first and then blend. The more times you try to blend and then color, the more stubborn each additional application of pigment will be because every time you blend, you force more color into the tooth.