In Electronics which thing is difficult for you?

ironing the layout on a copper board for etching..

THERE IS NOTHING WHICH IS DIFFICULT. IF YOU ARE INTERESTED AND HARD WORKER THEN ....

FOR ME TROUBLESHOOTING DIFFERENT TYPE OF ELECTRONICS CARDS IS VERY CHALLENGING AND INTERESTING. SOME TIME IT IS VERY DIFFICULT TO TROUBLESHOOT BUT THAT'S THE PART I LOVED ABOUT IT AS I SAY EARLIER "CHALLENGING" BUT "INTERESTING ".

All of Electronics

None of any

Electrical interface

When chaking an analog circuit

The difficulty issues related to electronics circuit  design could be avoided if one approches to the design solution algorithmically, for example the difficult task in electronics is UHF wave shaping and rf shielding to avoid interferences with in the circuit and proper bypassing the unwanted signals.