Having Difficulty Weight painting for Rig?

Hello, I am trying to weight paint my character to animate; but, I having two problems.
A. When I weight paint the character, the vertexs move.
B. Two of the his legs intersect, how do I weight paint the legs, Without moving the legs. Can I hide one leg?

When you weight paint the character, the vertices are supposed to move. I am assuming you have posed the character and are correcting the painting on parts that deform incorrectly. You can hide the leg and it won’t be painted.

Something visual would help, like a screenshot.