You're pretty tiny, just a little bigger than my gf, and 10mg is enough to have her pretty loopy. If you're just trying to feel it than 5-10mg is probably enough, 15-20 is gonna have on-the-couch fucked up most likely. Vicodin/hydrocodone also has a tendency to make people nauseous at higher doses, so going past 20, especially your first time, might just make you sicker without higher.
Make sure to look up cold water extraction (CWE) if you were thinking of eating a bunch of pills at once.