Spaghetti squash can be challenging to cut until you get the hang of it. Using a very sharp chef's knife, stab 1-2 inch deep cuts in a line around the squash where you intend to cut it. Make the cuts about an inch apart. Once finished, it should be easier to cut along the line into two halves. Keep in mind, that the middle of the squash is relatively hollow except for a pit of seeds that you will need to scoop out.