You do not need to book a tour with a travel agency to see the northern lights. If the sky is clear and the northern lights activity is good, you can see northern lights even from the city center of Tromsø.
However, booking a tour with an experienced guide is always better if you want to increase your chances of seeing them.
On cloudy days, the guides are excellent at reading the local weather forecast and choosing the spot with the most significant chance of a hole in the cloud cover. If the weather forecast looks dim, they might drive you all the way to Finland and back if that is the spot that promises the best chances for the night.
In addition, you will learn a lot about the region, local legends, and the northern lights themselves. The guides will also take pictures of you and the lights, which requires some practice, and they will give tips on taking great pictures with your own camera.
However, exploring on your own gives a certain satisfaction and peace that joining a tour cannot provide. If that´s what you are looking for, then you need our Interactive Map of Tromsø, which includes 48 spots around Tromsø that the professional northern lights tours use.
You might also want to check out our article about which Aurora tracking apps to use and how to read the Aurora forecast.