Apart from loads of free tutorials all over the internet I can recommend buying Steve Caplin's 'How to Cheat in Photoshop CS2' then you will be welding kitten heads onto dogs seamlessly with all the correct colour matching algorithms in no time ;)
www.amazon.co.uk/How-Cheat-Photoshop-Creating-Photorealistic/dp/024051985X/ref=sr_1_4?ie=UTF8&qid=1337418096&sr=8-4
(www.amazon.co.uk/How-Cheat-Photoshop-Creating-Photorealistic/dp/024051985X/ref=sr_1_4?ie=UTF8&qid=1337418096&sr=8-4
maiden is filmed before a live studio audience,
Sat 19 May 2012, 10:02,
archived)