He that is wounded in the stones, or hath his privy member cut off, shall not enter into the congregation of Jehovah Elohim. - Deuteronomy 23:1
Removal of the prostate is a serious impediment to the alchemical work, for whoever loses the natural functions of their creative organs cannot effectively work in alchemy. However, through the regeneration of the Holy Spirit through Runes, pranayama and the Tibetan Rites, this individual can work in a singular fashion and prepare his consciousness for a new body in a future incarnation.
Yes, the practitioner may ask their Being to take them to Klipoth, so as to investigate the terrors of the abyss. You may find, however, that even without asking, your Monad may need to show you the suffering that occurs in the interior layers of the earth within the parallel fifth dimension, so as to inspire you to change. Speaking from experience, it is a profound motivator for the spiritual work.
Different schools have different perspectives on the qualifications of an instructor. The most important one is that your Being guides and instructs you to teach. This is really what defines a missionary, when God commands you to proliferate this doctrine to humanity. If you examine the life of Jesus, he taught as one having authority, but not derived from the scribes of Israel. He received his authority from God.
Taking an mission or instructor course can prepare you intellectually with the tools you need to teach, as well as feed you with the discipline, practice and inspiration to work in a more serious way. However, the real work depends on your own connection to divinity. This is what defines a true teacher. You will know when you're ready when you are ready, through patient re-evaluation of your knowledge, practice and internal experience with God.