This is always a good idea anytime you’re modifying the partition table.
Note: Before you do anything, back up your Mac. Check out our full video walkthrough inside for the details. The installation can be a little time consuming, but it is by no means difficult. If you’re interested in installing Windows 10 on your Mac’s internal drive, you can easily do so by means of Microsoft’s Windows 10 ISO download and the macOS Boot Camp Assistant.