From what I can gather from your post you're trying to use these for true medicinal purposes - which is groovy. I have no experience with kpin so I can't help; I bet 10mg of Valium would put you in a good state, but not "high" per say. For Xanax I would start with a QB which is 0.25mg and if that doesn't work fairly fast (in my experience Xanax kicks in the fastest and lasts the shortest) take another 0.25mg to get to .5 like socially awkward said. Everybody's tolerance is different and the key here is to not overdo it as with benzos you'll essentially turn into a zombie. I'd suggest trying these doses out individually and on your own or with people who won't judge if you get "barred out." You very well may get really high off of even half a mg of Xanax, and you could just as easily not feel it at all (doubt that though). Just figure out what different dose strengths do to you and which suits your needs the best. Hopefully I gave you a little
bit of good info here.
GEAUX TIGERS