It is not a difficult job; I did mine last week. The hardest -- or most tedious -- part was removing the brake caliper and flushing the brake fluid, and then bleeding the brakes without assistance.

Be sure to measure out the appropriate amount of grease for each wheel: 60 grams per side. It's also important that you form a "dam" on the lip of the hub in between each bearing, in order to keep the heated grease from flowing away from the bearings. Also, put copious amounts of grease in each bearing...until you see it squeezing out the other side as you pack them.

It's a fun job, though potentially messy; I suggest disposable rubber gloves.

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Matt
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1995 E300 Diesel (Die Blau Frau)