Hello,
I am actually fairly new myself, I have brewed eight 5 gallon batches on an electric coil range with a 16 quart kettle (partial boil) and have yet to have a boil over.
So what I do is this. First, I do keep a bottle of clean sanitary water at hand in a spray bottle. Second, I watch that pot like a hawk. They say a watched pot never boils but we brewers know that a watched pot in the brewing business WILL boil and better watch it!
This may not be the best process but has worked for me. When the extreme rise in the wort does begin just before the wort begins to boil, I apply upwards pressure on the kettle handles to decrease pressure on the coil. Once it has settled a bit, I let it back down and then spray the top with the water. I will go through this process several times while adjusting the heat downwards into rolling boil territory. If all else fails, I will remove the kettle entirely but have only had to do this once.
Hope this helps the brewers even newer than me.