The configuration isn't easy, but if you know what you're doing, it's not that difficult. It's an enterprise unit, so it supports a ton of options beyond a guest network like VLANs and such. You need to know that networks, SSIDs and radios are separate things and you need to manually define and link them al together. (SSIDs link to networks, radios and SSIDs link together).
Once all configured, the PC doesn't need to be running. What happens is the software runs on the PC, you configure the settings, then the configuration files are sent to the access points. Except for monitoring, the PC software doesn't have to run and the access points can run autonomously. The PC software is only for configuration and monitoring and once the configuration is done, unless you want all the pretty stats and graphs, can be ignored.