I haven't dealt with them personally, but I've heard that if you come in contact with mesoamerican deities (Inca gods/goddesses as well but to a lesser extent) you should be careful. In general they are short on time. Everything must happen at an appointed time. If you call upon them unexpectedly (or later/sooner than you planned to) then you'll have a hard time getting them to cooperate.
Hope this helps.
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