"Is there a better way to hang indoors??"
IMHO, the ENO indoor hanging kit is the only solution for hammock suspension indoors. If you were to buy the components individually, you would likely spend more money. Everything included is quality, and it does come with basic instructions. You will need a drill and tape measure. The main thing to always remember is that you need to be able to attach these screws through studs. The cord knots are easily loosened, and you can make the loops smaller to fine tune things in the end. It's better to be to be too far apart than too close because you can always compensate by adding a strap/cord.
What's this set up got that a good eye bolt doesn't? STYLE! While bolt would serve the same purpose, these look better and function quite well. Let's face it, if your going to hang a hammock in your house, an eye bolt just doesn't look as good as these little wonders! Solid and sturdy! as long as you make sure your in a stud, it will take more weight than your hammock can!