First of all you have to make arrangements with those who will host you: the farms are not hotels. Hosts often have many commitments and few places. If you arrive without warning you risk finding they have no space, or worse, find no one at home! Use the direct contact form you can find on the farm description. It is not advisable to telephone for the first contact but after this initial contact it may be more useful and effective and facilitate a better exchange of information. Explain who you are, what you can do and what your interests are. Good communication is essential for a good experience.