You may be able to retorque your tires yourself, but it's best to leave this job to the professionals. Here's why:
Tires need to be properly inflated in order to maintain their shape and prevent excessive wear. If a tire is under-inflated, the sidewalls will bulge out and the tread will become shallower. This can lead to blowouts and other serious problems. On the other hand, if a tire is over-inflated, it will ride hard and could break apart at high speeds.
In order to retorque a tire, you'll need a torque wrench that is calibrated specifically for tires. Most torque wrenches are not accurate enough for this job. You'll also need to know the proper torque specification for your vehicle's tires.
If you don't have the proper equipment or knowledge, it's best to leave this job to the professionals. They have the experience and expertise to get the job done right.