You just turn off your main breaker, open up the panel, and snap the CTs/current transformers around one of the wires on each circuit (you can open them back up if you mess up). You only want to put one wire through, rather than a full romex bundle, because it measures the flux through the loop, and the return path would cancel out the reading.
It does take a bit of reading to figure out eg what to do with 240v circuits (you can usually double it if you don’t care about absolute precision, usually one leg has the control electronics on it and is a bit higher). Also, it doesn’t have quite as many channels as most panels’ max # of circuits, so you might have to choose, or try to run multiple wires through one CT.
If you’re uncomfortable with going into the panel (reasonable), you can probably find an electrician that’s willing to put it in/make it pretty.
I think I saw some YouTube videos of people installing them diy before I tried, that might help get you more comfortable with the process.
It does take a bit of reading to figure out eg what to do with 240v circuits (you can usually double it if you don’t care about absolute precision, usually one leg has the control electronics on it and is a bit higher). Also, it doesn’t have quite as many channels as most panels’ max # of circuits, so you might have to choose, or try to run multiple wires through one CT.
If you’re uncomfortable with going into the panel (reasonable), you can probably find an electrician that’s willing to put it in/make it pretty.
I think I saw some YouTube videos of people installing them diy before I tried, that might help get you more comfortable with the process.