Acharyas do have guidebooks but I dont think the Brahmanical discrimination of some not allowed to read them is present in Jainism. Every Jain aspiring to become a monk, prior to adopting monkhood, (should) learn the ethical path to be followed…
Also what is to be done in different scenarios of uncertainty is provided in those texts of charnanuyog with minute details…
They may or may not have to go with this. (I am not saying that glasses are allowed, only the fact that sallekhana is not the only available option)
When to take sallekhana and when to adopt a shravakhood instead of going with sallekhana is also given in them… many complex scenarios are already dealt with in them, though only theoretically.