Just did a full install overnight with the Preview of Windows 10. If anyone is interested in installing, the process takes a while. If you do not have your restore disc or a Windows 8 disc I do not advise installing (It's still only a preview and will be disabled early next year).
1) Back up all necessasary content.
I skipped this step because I left the system untouched when I went to Windows 8.1. There was nothing I wanted.
2) Download the Preview iso.
http://windows.microsoft.com/en-us/windows/preview-iso
The key listed may not be needed for the install, but copy it just in case.
3) Mount the iso in a virtual drive.
I have tried burning an iso, but my system would not install that way for some reason.
4) Enter the iso's folder under Windows File Explorer and double-click "setup.exe".
During the installation, when it reaches the "Ready to Install", click on the "Change what to keep" link. Disable all check boxes and continue (If you choose not to you may not be able to install). Let the install do it's work and be ready for a few resets.
The final reset may give you a blank screen with a few pixels scattered.. It happened with mine.
Side note-
I think the drivers for everything were ported during the installation.