Do not attempt to quilt when you are distracted or under a lot of stress. Last year at this time, I managed to zip right through my sewing machine cord with a rotary cutter. It's a wonder I didn't electrocute myself.
If things are going poorly in the sewing room, don't be hesitant to just walk away and shut the door.
Remember that quilting should be a joy, not a chore. If you put all sorts of deadlines on your projects, you've sucked the joy right out of them. Also, if you aren't feeling the project, don't force yourself.