Easy assembling. Only soldering the headers, connector and switch via a very good step-by-step description.
The installation of Visual Studio Code and PlatformIO wasn't that hard as well as downloading the example program.
By changing some settings in 2 files (platformio.ini and src/settings.h) after I had done my registration at OpenWeatherMap I was able to compile and upload the code. Unfortunately it didn't work at first time. Checked the hardware, soldering and connectors a few times but didn't see any issues. Checked the forum to find similar cases but there where none. I Contacted ThingPulse and within a few hours I got response from Dani. With some help I managed to get it to work.
Great job!