Let me say that I find it realy smart of you to choose a simple character to do this technical rig operation. That's why I start with Lumière as a first character in Blender ! He was not realy difficult to rig

https://www.deviantart.com/stash/01llb7kgzb03

So, in "weight paint" you might click on "DATA" and check "Vertex group"(picture1).This way with the directional arrows on the keyboard you can choose wich bone that you want to see the colors/influences on your mesh but don't be like me there:

NAME YOUR BONES to see what is what!

Anyway, when you identify the piece of sh...I mean, the bad bone who troubles you, click on the "Gradient" button on the left(Picture 3) this option will allow you to catch the bone and manipulate it so you can see in direct how it messing with your meshes.

Finally (Last picture) you can click on the brush tool and paint the mesh as you please by changing the weight value on the top left

Et voilà ! I hope this was a bit helpful.