I actually found 3-2-3 one of the easier techniques to learn in cubing. Spreadsheets aren’t a great way of teaching it as it doesn’t really use algs. The steps are
1. Slice out basically insert 3 edges in the opposite slice and then slice back to pair them all.
2. Insert another edge in the opposite slice and pair. Take it out and replace with another unsolved edge like the beginner method but do so in such a way that they end up in opposite slices so that they pair while slicing back.
3. Repeat step 2 again. May have to use slice/flip/slice in step 2 or 3, but for step 2 there is often a better way.
JPerm’s tutorial builds off this idea, and the thing you might be struggling with is the multitude of special cases. Such as edges getting stuck or a separate l4e where the pairs don’t interact with each other. Hopefully if you understand the foundation of this edge pairing method that will prepare you better for the special cases, as it’s overwhelming if you don’t understand the basics