Nothing is pre-assembled in this kit - you receive a non-populated circuit board, a faceplate, all necessary components and an assembly manual. Soldering, testing and troubleshooting has to be managed by you ... we don´t have a clue about it ;)
As with all DIY kits: We are not responsible if your kit does not work or if something gets damaged. We can´t give advice how to solder or how to build the kit. If you are not sure if you can finish the project, then don´t start it.