Sorry 🙂
Carbon copy clone is a free piece of software that makes an exact copy of your old hard drive onto the new one, but u need to be able to connect both hard drives to your laptop. A 2.5″ usb caddy is about £5 and holds your new HD and let’s u plug it in via usb.
Once connected, go into applications > utilities > disk utility select the new hard drive, click on partition then format as mac os extended (journaled)
Download and instal carbon copy and follow directions to clone your old hard drive to your new one. Once complete just swap the new hard drive with your new one and you’re away.
If you instal a fresh operating system you will need to use the migration assistant to copy acrossyour old files and settings.
Making an appointment with the apple genius bar may get u some help with this as well ?