The manifestation of confusion work can range from mild fogginess, throwing your target off slightly in order to lose paperwork or misplace important documents, to complete disorientation. It is up to the worker to decide what the situation calls for and what would be the most beneficial method to apply.
Personal concerns are anything that carries the DNA of a person such as hair, nails, blood, urine, semen, sweat, clothing and anything else you might be able to get your hands on (although you might not want to get your hands on any of it). Personal concerns are used for a variety of reasons in hoodoo work. Unlike other forms of magic, they aren't just used as a sympathetic connection, their use is much more varied and direct.