There is no one-size-fits-all answer to this question, as the best way to cut a blouse will vary depending on the style and fabric of the blouse. However, there are some general tips that can help make cutting a blouse simpler and easier.
One important tip is to use a sharp pair of scissors. This will help ensure that you get clean, straight cuts, and will make it easier to cut through multiple layers of fabric if your blouse is particularly thick.
Another tip is to use a pattern or template if you have one. This can help you to ensure that your cuts are symmetrical and even, and can be especially helpful if you're cutting a more complex pattern.
Finally, it's often helpful to cut slightly outside of the seam allowance. This will give you a bit of wiggle room in case you make a mistake, and will also help to ensure that your blouse still fits after you've cut it.