I'm an LOTW user and setting up the account in the beginning was tricky to say the least, but I have my certificate(s) and have been a LOTW user for years. I have TQSL on my PC, Raspberry Pi 3 and Mac.
Recently I started using a Raspberry Pi for digital modes. I have installed WSJT-X and Fldigi on my RPi3 and am happy to say it works very well.
I saw the TQSL application for the Pi, but never did set it up until recently….