You should use cutting oil frequently (like every cut). Even though I use a cutter with an oil reservoir, I still dip it into an oily rag before each cut (put a snip of an old t-shirt into an old plastic 35mm canister and wet it with cutting oil or kerosene). A good cutter is likely $35-50 now and you can damage the cutting wheel. Don't go back over a previous score, don't run your cutter off the edge of the glass. If you are planning to use a "hardware store" glass cutter, you're going to be disappointed. Look for Toyo cutters - good stuff.
Oh, and the video with the guy really jamming down on the cutter to make circles - you will destroy the life of your cutting wheel doing that. Glass doesn't need anywhere near that much effort to score and cut.
Greg
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