Running my first marathon

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Hey guys! I am running my first marathon in just over two weeks. Does anyone have any advice on what to expect? Is it any different that half marathons? I have run multiple races before but never the full marathon distance. Is there a point in the race that is more difficult than others? I hear the last 6.2 is the hardest part of the race... is this correct?

Also, where do you get the 26.2 sticker to put on the back of your car? After I cross that finish line, I want one! :)