While many investigations are very interesting, many are also very tedious. In addition to a keen curiosity and a desire to know, a good investigator must have a lot of perseverance and patience. Investigating is hard work. The hours are irregular. The pay is usually not that great, especially for beginners.
Investigators are often underrated and underpaid.
Investigating is about finding answers. The more you learn about a variety of subjects, the better an investigator you will be. If you really think you want to be a private investigator, you should make your first investigation an investigation of the industry itself. Find out all you can about private investigators. Read some books and take some courses.