On my '92 300SE it was real easy - took about 15 minutes total. Helps if you have an assistant.

One suggestion - go to the dealer (yes, the dealer) and purchase ALL of the plastic rivets that hold the pad in. The one's that are holding your hood pad in have been cooking under the hood for almost 15 years and most will break when you try to remove them. Possibly you can get them from Fastlane here on the site, but I couldn't find them listed.

Your car is probably different somewhat, but I'll bet the concept is the same. Remove the rivets - there's a central "tack" that pokes into the rivet housing. You'll need a flat-bladed screwdriver to get in under the head and wedge it up. Most likely, the head will crack and you'll be forced to grab it with pliers and remove it forceably. Once the tack is out, the rivet housing will pull free with little effort.

I think I needed about 10 or so rivets - you should be able to get them for a few $ each. Getting these parts from the dealer will give you an example of how they're supposed to work.