The free upgrade to Windows 10 should be the easiest Windows upgrade ever. Essentially you should receive a little upgrade icon in your task bar, you then click on it and “Reserve your free upgrade”. You’ll then receive a notification when the upgrade is available and run through the installation routine. As long as you have a legit copy of Windows 7 or 8.1 the upgrade process will take between 20 minutes to an hour.
I’ll say it sounds good, but I wouldn’t be in the first batch of people to do the upgrade. If you’re planning to upgrade make sure you do a bare metal backup of your PC before you start so if it fails you can recover your system. I would also say that if I had clients I wouldn’t do the upgrade on business machines for approx. 6 months to verify that most of the bugs have been fixed. I know from experience that device drivers on PC’s can be a beast during an upgrade and with so many different components in systems I would want to make sure vendors have had time to update their drivers.
You can check out Microsoft’s upgrade instructions here: http://www.microsoft.com/en-US/windows/windows-10-upgrade
And make sure to take a look at the FAQ page here: http://www.microsoft.com/en-us/windows/windows-10-faq