I've done clean installs every time I've upgraded my computer. My first clean install was Windows 98SE, from Windows 95. Later, I did a clean install of Windows 8, from Windows 7; then Windows 8.1 from Windows 8; and finally Windows 10 from Windows 8.1.
In each case, I booted the computer from a CD (in the early days) and later from a USB flash drive that had the Windows installer. In each, the clean install was flawless the first time.
There's no magic to getting this done, and you don't have to be a geek, either. Which is a good thing, because I'm no geek.
The key to my success, in each case, was careful planning. I spent many hours over several weeks learning everything I could about how a clean install is done, and picked up a lot of good practical advice along the way. I prepared a complete, step-by-step
battle plan, and I made sure that I had all necessary software already available before I started.
When the time came to do the deed, there were no surprises and everything went according to plan. I'm very glad that I invested all that time in research and preparation, because a top quality install is essential to the correct operation of a computer.
I am very certain that the time I spent has more than been repaid by having a computer that runs well and without problems.
Regardless of which operating system we're talking about, a clean install, correctly performed, on supported hardware is as close as you can get to a sure thing with a computer. And once you're all done, the next thing to do is to make an image backup of
your hard drive, so you'll never have to reinstall Windows ever again, unless you really want to.