Agree with most of Mach E. Avelli's post except that a 3 with a wobble pump can be started by one person if the engines are warm (from memory) by building up pressure with the wobble pump and then starting in the normal manner as described. The second engine is easy - select cross feed and the fuel pressure from the running engine provides the required fuel pressure for starting the second engine. Of course you need the other pilot outside to give assurance that the props are clear for the start!
Blackburn