You take Kent's special tools here and add them to a universal bearing sleeve puller, and you can do this yourself on the car!
Kent's full 25-minute video instructions are included at no extra cost. Watch the YouTude video below to understand these tools and why Kent is offering them for sale.
2007 to 2012 GL 320/350 GL450 GL550 Front Wheel Bearing Special Tool Aids
$48.50
SKU:
SRS-GLFWBEARINGTOOLS 
Product Details
You must purchase a bearing sleeve puller KIT like the one shown above. These are readily available on Amazon.
You get a very heavy steel sleeve of the correct size, a square washer plate, and three high-strength metric full-thread bolts.
And you get three very strong, high-quality metric bolts.