The disturbing noise often enters your house and rooms by the small cracks and openings in the walls. To prevent that noise, there is not point in starting to cover your whole walls with soundproof tiles or the floor with sound absorbing mats. There is a far easier solution and that is called soundproofing foams.
These foams are really easy to use as they come in prepared bottles and there are usually extremely clear instructions on the bottles of how you should use the foam. Once the soundproofing foam has been inserted to the opening, it will expand until the whole gap is filled and therefore there is not space for the sound waves to get through.
Soundproofing foams are very easy to use and even if you usually have not done a lot of building construction works on your own, it is almost certain that you will handle inserting soundproofing foam.
So if you have some kind of a noise problem and you have identified the location where the noise is coming and that is some kind of a small gap, than go to your hardware store, buy some soundproofing foam and use it. It is just as simple as that!