Today I got one of the Lora-modules hooked up to a breadboard. This took much more effort than it should have. If you want to buy some of these modules, I would recommend getting a version that has a 2.54mm pin spacing (if those exist), not metric 2mm ones. That should make things much easier when prototyping. Also make sure you know the pinout of the module. My seller didn’t include it. After some googling, I found the pinout of a board that looked suspiciously like mine, and visual inspection showed that the VCC and GND pins matched. Probing also showed that NSS matched, after which I just assumed that all the rest matched too.
I also added a 8 pin voltage level shifter module (bought on Ebay) to interface the 3.3V SX1278 to the 5V Arduino Uno. Unless I overlooked something in the datasheet, the I/O pins of the SX1278 are not 5V tolerant.
SX1278 hooked up to Arduino