The issue about the need for knowledge in the writing of  the get [divorce] or kidushin is unclear to me like I wrote a few days ago. The main point of confusion is the Ramban brought by the Ran that for a get one needs both for her sake and the husband should write it. That is how the Ramban gets out of the problem about why he could not say to a messenger [or two] to go and tell so and so to write a get and give it. The answer מילי לא מימסרי לשליח ''words are not given to a messenger'' clearly does not work as the Ramban himself noted. After all you can tell a messenger to take trumah or to write a document of ownership and give it to someone--and lots of things that require intension. But if you need the man to write the get, then that should be that. I noticed that Rav Shach deals with this issue, and I imagine many of the other Achronim also try, but to me the whole issue is unclear. [I might just give up. Or i might wait until i can gain clarity by learning further on.]