Fitting a CD Changer

I have just bought a Sony CDX-T69 CD Changer for my 52 plate Punto. I'd like to have a go at fitting it myself, bit I have a huge problem,
I don't even know where to start.
I was hoping to put the changer in my glove box but it won't fit, so was thinking placing it under the passenger seat. If I do this where do I connect the chager too? Do I need to take my current cassete player out to get to the back?
Sorry I am pretty clueless but any help will be much appreciated.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Site Timeline is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.