I want to replace the light fixture above the mirror in our bathroom. I haven't removed it yet, nor have I purchased the new one. The style I'm considering purchasing is basically a bar with decorative globes that will be attached to the wall. Are there any landmines I should be aware of? I've already replaced a light fixture in the hallway, all I had to do was connect the wires and screw the new fixture onto the exisiting box. Thanks in advance.