It will be a piece of cake for you.
Recommended: install the .18 firmware upgrade–see the sticky above. If your computer will not recognize the player (generally because the computer does not match the player’s initial requirements (Windows XP SP2 and WMP10 or greater)), put the player into hold (left-side switch), and then hold the center button down as you connect your player to the computer vis USB cable. And then upgrade your firmware.
If your computer is not up to the player’s specs, set the player to MSC (mass computer storage) mode (under settings/USB), in which the player is seen simply as a hard drive by the computer and you just drag and drop files to it, just as you do in regular computer use. The player retains all its functionality, except that files protected by (the dreaded) digital rights management cannot be used. If DRM is needed by you, use the player’s other mode, MTP (media transfer protocol) for that.