I am going agree with Frenchy 100%. From what little info that was provided this is a VERY ambitious feat. With that out of the way I am going to make a few assumptions and say; you are in good health, the trail is marked very well, there will be a lot of other people on the trail, and you have little to no experience outdoors. If all of these are true you about 25% there. You will really need to do a lot of homework on clothing and foot wear, foot wear, foot wear! I did a 65 mile hike this past summer and developed big blisters on my heals the first day and that wasn't the hardest part.
I would follow the advice of everyone else and do some test hikes 2-3 days with the foot wear you chose to hike in and approximately the weight you will carry. Also you should be prepared to improvise on the trail because no matter how much you prepare there is always something you will forget or never thought of.
That?s my 2 cents and good luck it sounds like a lot of fun!
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P.S. Pics and some commentary would be much appreciated.