12th house Lord and Lord of the 12th house in his OH
In my Navamsa Venus rules the 12th house from himself. If it would be another planet conjunct Venus ruling the 12th, it would be a separating factor. But now it´s Venus himself. Does it still work as a separating factor, separating himself from his path?
Also Mars is in his OH and rules the 12th Bhava cusp. Does the general rule applies that say that a planet doesn´t hurt it´s own house, so that there will be no or at least less separation than it would, had it not been in his own house?
NO, it will not operate as a separating factor. a planet in own house operates mostly from the house its in, so it wont give all the normal degree of 12th house stuff.