David Garrigues talking about Mula Bandha: In summary? It is a project not to be fretted over. Observe patiently, use imagery, discard imagery when no longer useful, trust your instincts, persevere as you observe your mind/body reactions, and above all do not obsess, which is definitely not the point of a breathing practice such as yoga. The Dude abides.
Also reading a little James Hillman (The Soul’s Code) can’t hurt.