It's not super complicated, but you are unlikely to figure it out without a couple internet searches. You have to setup the router, which isn't that difficult, and then wait to get connections. the torrent client is built into the router software, but you have to find the right I2P sites to get torrents because, as far as I know, only torrents inside the I2P network are usable. Each of these is pretty minor on its own, but adds up to a difficult experience for the average, non-enthusiast computer user.