Grandma adopted a puppy when I was probably 8 or 9. It got parvo. I remember going to her house and asking where the puppy was. She told me that he was sick, so he had to stay outside and I couldn't go outside for the same reason. When I would ask where the puppy is, she would tell me that he's on the side of the house where I couldn't see him. This went on for a long time, I never saw the puppy again and eventually forgot about it entirely.
A decade or two later I found out that my grandma had spent thousands of dollars trying to keep that puppy alive, but parvo took it anyways. She was very upset about it's passing and instead of having me go through it too, she lied to me about it until I completely forgot about it.
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.
I have been using tribler for a few years. It works well, abeit a bit slower than a plain torrent program, but still very reasonable.
I see a lot of people talking about using I2P for torrents but, as far as I know, I2P cannot use torrents from outside the I2P network. In addition to this, there is a non-trivial setup and confusing interface that people need to learn, whereas Tribler acts like any other torrent program, just with onion style routing. I really like I2P, but there's still more work to be done to attract more people and make it a truly viable alternative for most torrent needs.