Hello! Reformatting a MacBook is actually something you can do yourself, and it can help improve the performance of your device. Here are the general steps you can follow to reformat your MacBook:
1. Backup your data: Before you start the reformatting process, make sure to back up all your important files and data to an external drive or cloud storage. This is important because reformatting will erase all data on your MacBook.
2. Internet Recovery: Restart your MacBook and hold down Command + R while it's rebooting. This will bring you to the macOS Utilities screen.
3. Disk Utility: From the macOS Utilities screen, select Disk Utility and then click Continue.
4. Erase the disk: In Disk Utility, select your main hard drive (usually named "Macintosh HD") and click on Erase. Follow the prompts to erase the disk.
5. Reinstall macOS: After erasing the disk, exit Disk Utility and choose to Reinstall macOS. Follow the on-screen instructions to reinstall the operating system.
6. Restore your data: Once the reinstallation is complete, you can restore your backed-up data from the external drive or cloud storage.
As for the cost, reformatting your MacBook yourself is free, but you may need to consider the cost of any external drive for backup if you don't already have one. If you were to have it done at a shop, the cost could vary depending on the shop and location. It's always good to inquire with different places to compare prices.
I hope this helps! Let me know if you have any more questions.