If you already reserved your Windows 10 upgrade: Good news! Upgrade files may already have discreetly downloaded onto your PC. Just look for the notification that says your upgrade is ready, and run the installer. The whole process should take between 20 and 60 minutes, depending on your rig.
If you haven’t reserved your Windows 10 upgrade yet: Look to your system tray for a “Get Windows 10” icon. From there, you can either reserve an upgrade (Windows 10 will roll out over the next few weeks, so not everyone can get it day one), or go ahead and schedule an install if your device already qualifies. When your magic moment arrives, in the form of a notification from Microsoft, go ahead and run the installer.