Do you need a personal trainer? Of course! Everyone could benefit from a fitness professional who is always at their side for workouts, guiding them through an exercise routine, making it safe, efficient and enjoyable.
In the real world, unfortunately, most people can't afford a personal trainer at every workout. But expert guidance is important, especially when you're a beginner, and then whenever you learn a new exercise.
If you are getting bored doing the same workout at home, check out your local library to rent exercise DVDs. This is also a good way to watch exercise videos to decide if it's worth purchasing for your own.