check out one of our assembly guides: LVLS
We've published the Assembly Guides under a Creative Commons Attribution, Share Alike 4.0 International Licence, so you could for example take different parts from different schematics to combine or build into your own synth DIY circuits or breadboard creations, or, if you want to change the gain in your pre-amp, you can check the schematic and circuit description to figure out which resistor to change on the PCB.
But I haven't soldered before, we hear you whisper! The module designs are also adapted for an introductory level soldering from a couple of other viewpoints including for example adapted component solder pad sizes, and easy to read PCB silkscreens. If you feel like a bit of chat and banter when you're building your first kit, then pop along to one of our regular synth DIY workshops, where we run through everything slowly and step by step in a relaxed environment.
As there is a wide and varied range of modules in the Eurorack format, ranging from tiny 1HP passive modules to almost complete synth voices in one module, and as our modules are compatible with modules from any other Eurorack designers or makers, this allows for many different sound design and creative signal processing possibilities!