heres a good little trick,

water your plant, now pick it up 4-5 times and feel the wieght of it, it should be pretty heavy.

everyday pick up the plant and see how much the wieght changed, when it feels very light(you will notice a huge diffrence) its time to water it, i have yet killed a plant this way or over/under watered it.

you can soak your plant if she is dry just make sure the water runs through the bottom, then repeat step 1 and 2.