to make this cake [[http://www.marksandspencer.com/Marks-and-Spencer-Dinosaur-Cake/dp/B0029LTAUO?ie=UTF8&mnSBrand=core ]
I've never decorated cakes before, but feel I could surely attempt this one for far less than M&S are charging. What do I need to decorate it and how long is it likely to take? Am I being rash to take this on?