the new drive will supply migration software on their website, if they don't you can use macrium reflect.
a refresh on grounding first
Canned Grounding Rant-
shut down system and remove side panel. with the power cable plugged into the PSU touch a bare unpainted metal area of the case. (my favorite spot is an unpainted screw securing the PSU) once you have grounded yourself you can unplug the computers power cable from the PSU and can touch the system.
if you move your feet, or shuffle in your chair, plug in the cord, reground yourself and unplug again.
end canned rant-
now that the case is open and you are grounded you can install the new hard drive in the system.there are 4 screws that will secure the drive in the case (screwless cases notwithstanding) secure the drive and connect the SATA cable and the power cable.
the new drive is blank and will not be bootable so start the system as normal. make sure the new drive is seen in the disk manager. open explorer and right click on this pc (my computer, Computer) go down the list to disk manager and click on disk manager. a window will open and you will get a depiction of the drives. blue is the main drive and black is the new drive. if its there good, exit to desktop and install software/reboot to software (if bootable)
run the transfer software to clone the drives.
after the cloning shut down the computer and ground yourself. disconnect the power cable from the OLD hard drive. boot up the computer. if windows boots up as normal you are on the new drive (the old has no power). explore the folders till your comfortable that everything copied, run some programs ensure everything needed is working. shut down the computer, you can now remove the old hard drive. reverse steps for install. cables, screws, remove.
if you want to keep the drive as secondary storage. leave the drive in and connect the power cable. turn on the computer but when running check the disk manager, verify the new drive is labeled as the c: drive. if you are sure the c: is the new drive you can right click on the other drive (should be d: ) and you can format it from the disk manager. the system may have booted to the OLD HDD, if so you will need to reboot with access to the BIOS and change the boot order, you want the new drive to be the C:.
the process above is the way to do it without the external cradle/enclosure