I read in related questions that R. 'Haim Vital lists in his introduction to Ets 'Haim 20 conditions regarding whether one is fit to learn pnimiut. However, I cannot find such a list in the book itself. I'd like a precise source, preferably with a link. Thank you.
The list you are looking for seems to be towards the end of his introductions, in the paragraph beginning וצריך להתרחק (page 23 in this edition). He lists 10 things not to do and 10 things to do before learning this subject. There are other conditions mentioned, but only those 20 are in a numbered list.