posting.php?mode=reply&f=32&t=3661Blue tape is your best friend for those sharp lines. Many folks on here prefer to use a method we have dubbed "The Shaggy Method". Here's a link to it.
http://cornholewiki.com/Shaggy_methodI don't personally use this method, but it's been done for years and years, and people love it. Follow the directions, do some searches on this site for "shaggy method", and you'll be amazed at the wealth of information you'll find.
As far as the circle around the hole, everyone seems to have a different technique. I do this:
Tape off around the hole. Take a small dinner plate and put it in the hole. Mark off around the edges. Pick up the plate and check to make sure that the lines you just marked are equidistant from the edge of the hole. If so, turn the plate over and sit it down in the marks you just made. Hold it very firm, and go around the edge with a sharp razor blade. remove the blue tape and there ya go. Let me know if that made sense. maybe I'll get some pics up for you.
Good luck with your painting.
Milky