Dear Naiseme:
You just have a case of "cold feet". Go on the trip and you will have a great time. By your second day you will be laughing at yourself that you considered backing out. If the worst case scenario does materialize (rain every day, crabby locals, mechanical problems and headwinds every day) you can always just go back home.
Last summer I planned a cycling vacation in Romania that was to be totally self supported. When I talked with my bike club actquantces they got me nervious about "what might happen". I decided to ignore the nay sayers and had a wonderful vacation. Please go on your planned trip. I am sure that you will have a great time.
John