You need a reasonable level of soldering competence, a knowledge of electronic components and to be able to work safely with electricity; instructions can be downloaded from the
PV Electronics website to see exactly what is entailed. The ICs and tubes are mounted in sockets so you don't have to solder the legs directly but they are nevertheless a little bit fiddly, as are the (optional) surface mount LEDs. Although powered by a 12V DC supply, there is a High Voltage Generator circuit (150V - 190V) that has to be safely tested.
The instructions include the following warnings:
DANGER: The clock pcb includes a switched-mode voltage booster circuit. This generates nominally 170 Volts DC, but is capable of generating up to 300 Volts before adjustment. Assembly may only be undertaken by individuals who are suitably qualified and experienced in electronics assembly, and are familiar with safe procedures for working with high voltages. If in doubt, refer to a suitably qualified engineer before proceeding.
The voltages generated by this circuit can give a potentially LETHAL ELECTRIC SHOCK.
DISCLAIMER: This product is supplied as a kit of parts, intended only for suitably qualified electronic engineers, who are suitably qualified and experienced in electronics assembly, and are familiar with safe procedures for working with high voltages. The supplier, his agents or associates accept no liability for any damage, injury or death arising from the use of this kit of parts.
This is not a finished product, and the person assembling the kit is responsible for ensuring that the finished product complies with any applicable local regulations governing electrical equipment, eg. UL, CE, VDE.