Hi Nightshade.
Everything you need to know is in the link dal has posted.
Top tip...
One of these little terminal tools will make the job of removing the pin a whole lot easier
And lessens the chance of damaging your wiring or plug.
http://www.ebay.co.uk/itm/Terminal-Extraction-Removal-Tool-Set-De-Mounting-Remover-Durite-0-703-99-NEW/192248104292?_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D45992%26meid%3D388924265bc2485ab0a3ffb81753aa47%26pid%3D100005%26rk%3D5%26rkt%3D6%26sd%3D331684034679&_trksid=p2047675.c100005.m1851
There are others, some cheaper and some more expensive.