Maybe be soldering you mean "soldering with a pencil or iron"Have seen complicated circuit they dont solder on it, How do they do it?
They are soldered on, if you can't see any trace of the solder, you're not looking properly.When i saw the circuit board of my damaged handset, i wondered how it was done cos all components are neatly mounted on the pcb with no traces of soldering.
You need to learn how to solder, it's simple, and only take a few minutes to learn - I taught my daughter when she was about 8 years old?, ten minutes instruction and she's built a number of items over the years with never a problem.The problem i have is that most of the time when i finish mounting components on circuit board, it will not work and i try to figure out what was happening and discovered that some of the components have been damaged due to the heat from the soldering iron. Thats why am searching for a soldering alternative so that i can completely do away with heat and save those damages caused by heat.