Is there a guide on wing mirror replacement any where?

Some wasteful life form has decided to take mine clean off (it was no accident) and its currently hanging via the electrics but some of the assembley is still attached to the car. Just need to know how to remove it amd fit the new one (luckily managed to find a breaker with one from a red lcr same as mine)

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Gave it a jump start outside my daughters school as the battery died. Gonna get a battery from ecp tomorrow. Any suggestions for a decent one. What is the amp and cold crank rating needed for a diesel?
 
10 quid altogether mate. Available for post 2003 only. Mine whined in first 4 gears now it's perfect. I can't do anything on my phone which I'm using now. But will use pc tomorrow to do so.