Put the liquid in first. Surrounded by water or juice, the blender blades can move freely. Next, add your greens, with chunks of fruit or vegetables going into the pitcher last.
Start slow. If your blender has speeds, start it on low to break up big pieces of fruit, then work your way up to high for a puree. For blenders with function buttons, pulse a few times before switching to puree mode.
Thicken with ice. Added too much juice or coconut milk? Toss a few cubes in the blender and voilà!