Am I missing something? Why don't the practical instructions lead up to the final stage of "enlightenment" and instead stop at "partial enlightenment"? Is there a further stage after #4 that might be even more dangerous than #3 and that you don't think is safe to describe to anyone who isn't already at #4?

The practical instructions don't go further because the issue of going further is complicated, and trying to describe it in a reasonable and useful way would have made this post much too long.

If you can handle stage three, I would have no worries about your ability to handle anything afterwards.

I've never read Gurdjieff, so I don't really know. Terminology is tricky and I wouldn't venture to guess unless I was more familiar with what "many I's" means.