1.) It shouldn't take much pressure. The processor should drop in with no pressure at all then the latch should push down and snap in easily.
2.) Yes you can move the wires just make sure they are kept clear of the fan so they cant catch on the blades. Secure the wires somewhere with zip tie.
3.) The wires should be insulated enough not to melt but I would still secure the wires so they are not touching the heat sink.