Clive,
About 35 years ago when I was in High School I built an amp in electronics shop. That's about the extent of my background. The kit comes with complete instructions. It's not exactly step-by-step but pretty close. Between reading the schematic and the layout drawing I think anyone willing to take the time and work slowly should be able to complete it. If you don't have any soldering experience I would suggest getting a 40watt soldering iron, some solder and a bunch of connectors from Radio Shack and spend a couple of days practicing.