It's often a good idea to label cables so she would know what belongs to what, but Joan shouldn't really worry about it. They're pretty much built to be plugged in without incident, as long as she's not trying to force it into a recepticle it's not designed to go into. It'll either fit or it won't. Many cables are also color coded, so she should make sure to check for that. To be safe, Joan could probably get a college or high school geek to set it all up. They'll know how.