If you have all your drivers and don't need any of the manufacturer's bumf then no. You most probably wont need any of the drivers you've saved but a good move though. Might be easier if you have the OS on a DVD, if your laptop has an optical drive, but a bootable flash drive works. This tutorial is good , especially the section that shows Custom: install Windows only (Advanced), then delete all partitions until you have one unallocated space.
OnePlus 5T review: Hands-on