Yes, it is possible to format your laptop by yourself, but it is not recommended unless you are knowledgeable about computers. Formatting a laptop involves wiping the entire hard drive, so it is important to make sure that you first back up any important files and documents before starting the process.
To format your laptop, you will first need to access your laptop's BIOS menu by pressing a certain combination of keys during startup. From the BIOS menu, you will need to select the 'Format Disk' option in order to wipe the entire hard drive. After that, you may need to physically remove and reinstall the hard drive in order to reinstall the operating system.
It should also be noted that formatting a laptop will wipe out all data that is stored on the hard drive. So it is important to be extra careful while doing this process and make sure that all important data is backed up beforehand.