This is the stuff that keeps me up at night....

[Ironriot]

Refer to the wiring diagram, work slowly, don't panic, replace rubbish connectors with decent crimp ones. Don't cut any wires out of your loom unless absolutely necessary (e.g. bodged work by previous owner).

Also, one useful convention, if power is coming from somewhere (e.g. from the alternator or from the battery) use a female connector. If for any reason it becomes unplugged (or you forget to plug it in, heaven forbid), then it won't immediately short your battery or alternator onto the frame (bad news either way!)

Beergood was right. NUGGET OF WISDOM INDEED!