As a qualified solar panel fitter for properties, I would recommend checking your connections before fitting, its a myth that you will get a shock when connecting. If the cables have the correctly fitted(and correctly fitted) connections there should be no way you will get a shock. As a precaution I would wear goggles to protect your eyes from a possible small arc, but the chance of this happening is small. Solar panels are live as soon as they are in daylight(not just sun light), so as soon as we get them out of the van to fit, the panels are live. You are able to handle them, the only way to get a shock is off a bare/damaged cable or off the male and female ends of the connectors, these should be covered in sleeving which stops you getting harmed.
A compass is a must when using them on a boat. South is the optimum direction to point them, but south east or south west will produce some power. Be aware of any shading like trees or shadows off buildings/bridges/boats. A yearly clean is a must and beware of them getting covered in tree sap.