If you love Windows and just can't wait for the final public release of Windows 10 then don't worry Windows 10 Technical Preview is here and available to download and install at your leisure. Microsoft made the OS available for download recently and it's available free of charge.
If you want to get up close and personal with the latest version of Windows then you have a couple options. First up, if you have an old PC that isn't doing very much then you could install Windows 10 from a flash drive. That may not be the best solution. We think it would be better to run the new OS inside a 'sandbox' a virtual machine. This way it won't affect your system in any way and it'll be more convenient than rummaging around for that old PC.