I have found that using pruning shears work much better than conventional wire cutters. They are spring opening and have wide gap to get on the wires easy. Normal shears will cut a 3/4 " to 1' limb.
I went to the local hardware store and found the Fiskar brand ones work very well, they have an internal spring and a thumb release. These are really easy to use with structural gloves and cut wires & cables really easy.