I do not know how to figure out schematics I usually go by color.
Blue to blue, and brown to brown. Shouldn't really make any difference which pole (side) of the switch they go to (as long as it matches). The P300 connector will show you if you've got it right without power applied.
To translate the diagram.. It's a DPDT switch. P300 pin 1 flow goes to the center connector on the COM-2 side of the toggle switch (usually the center connector) and connects to the normally open (NO-2) output tab and then back to P300 pin 4 When you press the "1" side of the switch it completes the circuit. P300 pin 2 follows the other path. If you use a multi-meter to verify make/break continuity on the switch and compare it to the diagram it should make sense?