I bought this brilliant book

Several years ago, I think it was about 2005 when I was taking classes at the college where I taught, I was trying to develop my Photoshop skills and was recommended a great book called 'How to Cheat in Photoshop' by a man called Steve Caplin. 

It's excellent as it's fairly easy to follow and has a CD and details, for both Mac and PC, on how to create realistic photo montages. My version is still available on the Amazon Marketplace for 52p plus £2.80 delivery:

http://www.amazon.co.uk/gp/offer-listing/0240517024/?condition=used&tag=marketp-21&dev-t=D10SBASHC4I9Q1&SubscriptionId=1BW5SQWXHT1FXDBZGW02&linkCode=xm2&camp=2025&creative=165953&creativeASIN=0240517024

I noticed when I used the website megashopbot.com to check if it was still available that there was a later version, released in 2010 with prices starting at £17.96 including postage for a brand new book.

http://www.amazon.co.uk/gp/offer-listing/0240522044/?condition=new&tag=marketp-21&dev-t=D10SBASHC4I9Q1&SubscriptionId=1BW5SQWXHT1FXDBZGW02&linkCode=xm2&camp=2025&creative=165953&creativeASIN=0240522044

If you want to develop your Photoshop skills then I would certainly recommend it, I've had great fun and produced some realistic images.  I also noticed that there was a version for Elements 10 at £16.76 for a new version.