Sometimes when knitting in the round, your needles will be too long. This might be the case for the entire project or will happen when you need to start decreasing. When this happens you can use a method called "Magic Loop" or use double pointed needles.
While double pointed needles can feel awkward to work with, I recommend using this method if you're a beginner as they will help keep your stitches tighter as you decrease. This method is used for The Super Chunk Hat Knit Kit... watch the video to learn how!