To regrip a tennis racket, follow these steps:

1. Remove the old grip completely and clean the racket handle if needed.
2. If using a replacement grip with a collar, slide the collar on the handle before wrapping the grip.
3. Peel off the adhesive backing from the new grip's tapered end and attach it firmly at the butt (bottom) of the racket handle.
4. Wrap the grip around the handle with steady tension, overlapping each layer by about ¼ to ½ cm. For right-handed players, wrap clockwise; for left-handed, wrap anti-clockwise to conform to hand comfort.
5. Continue wrapping until you reach the top of the handle, then stretch the grip slightly to smooth out any bumps.
6. Mark and trim any excess grip at the end of the handle for a neat finish.
7. Secure the end of the grip with finishing tape, wrapping it tightly in the direction you wrapped the grip.
8. Optionally, slide the rubber collar back down to the base of the handle.

This process improves racket control and comfort and can be repeated as often as needed depending on play frequency and grip wear. These steps are the general consistent method from various expert sources explaining how to regrip a tennis racket precisely and professionally.