I recommend wearing gloves when cutting jalapeños as the heat from the peppers can burn your hands and don't touch your face or eyes during the process. Trust me, I know from experience. I slice each jalapeño in half lengthwise and have found that spoons work great to scoop out all the seeds in the jalapeño slices.  Removing the seeds reduces the heat from the hot peppers, but if you enjoy spicy foods, then leave a few seeds in to add more heat to your jalapeño poppers.