If you have recently moved into a new home it is very important to change all door locks as soon as possible, you will never know how many people have a key cut for your existing door lock.
Over 5% of home burglaries occur when a criminal has a key to the building. Replacing your door lock is not as hard as it sounds. You can remove the cylinder by unscrewing the latch and pushing through. All cylinders are a standard size so it will be easy to replace.
We also advise that you inform your bank and post office that you have changed address as well as changing utility providers.