The answer to this question depends primarily on what kind of trimmer you’re using, how quickly you’re trying to work, and how close to the skin you’re trimming the hair. Manual trimmers tend to be a little more painful than other models due to the likelihood of the trimmer merely grabbing and pulling the hairs out rather than actually trimming them, for example. Most electric trimmers, whether battery-operated or rechargeable, are rather gentler. Additionally, there are some steps you can take to make the process easier on yourself. First, read all of the instructions that come with your trimmer and make sure you’re clear on any hazards or use practices that you need to be aware of. Next, you want to make sure that you only use the trimmer in a well-lit area where you will have access to a mirror. The better you can see where you’re trimming, the less likely you are to cause yourself any undue pain with cuts or worse. Only trim what you can see. Finally, keeping the trimmer clean should be a priority after every use. A trimmer that is clogged will not trim as well and may painfully catch and pull hairs lose rather than trimming them neatly.