How to clone my HHD to SSD on my mid-2009 Macbook Pro
I wouldn't recommend having the boot drive mounted to do a proper clone. If you have an external drive (preferably firewire 800 for that model, but USB 2 will also work), install a current versions of macOS onto it. Boot to that drive by restarting and holding down the Option key at boot, and you can select the external bootable drive. Now that you are booted to your external, install your clone software of choice, in your case Carbon Copy Cloner (I personally like SuperDuper! but that is me). Once you have the software installed, start cloning the boot disk to the new SSD.
As a side note, make sure that you partition your new SSD before you start the process. That way you don't run into an error because it is FAT32 partitioned and not GUID.