It’s interesting to me that you seem to have an intuitive sense of the correct practice of hatha yoga. The hatha yoga pradipika suggests avoiding things like to much heat, heavy physical labor, fasting and other austerities. The original without commentary makes for a quick and interesting. Below is a quote by B K S Iyengar from a forward he wrote for a translation and commentary of the Hatha Yoga Pradipika.

Svatmarama says that practice has to be done without thinking of its fruits, but with steadfast attention, living a chaste life and moderation of food. One should avoid “bad company, proximity to fire, sexual relations, long trips, cold baths in the early morning, fasting, and heavy physical work”. (1.61). In 1.66 he says that yoga cannot be experienced “by wearing yoga garments, or by conversation about yoga, but only through tireless practice”. Earlier, in 1:16, he says: “Success depends on a cheerful disposition, perseverance, courage, self-knowledge, unshakable faith in the word of the guru and the avoidance of all superfluous company.” And Patanjali says, “faith, vigour, sharp memory, absorption and total awareness are the key to success”.

If you can not find an external teacher, perhaps you would be willing to trust yourself to teach yourself. Hittleman is very supportive of the idea of one’s internal guide (guru). His books are specifically written to those who are self motivated and wish to learn a correct
approach to the study and practice of yoga by themselves with a book as a reference and guide. While I think that “Yoga: the 8 steps” is the most complete of his books, it does contain a ton of information/perspective in a short space. It also addresses other aspects of yoga in addition to hatha. Hittleman’s books, “Introduction to Yoga” and “Be Young with Yoga” are excellent self study guides (not
so dry for Hatha and are readily available on Amazon for mere pennies.