I was in the same boat- or diving board- with a looming deadline and no knowledge about Photoshop- www.lynda.com saved me- a illustrator friend recommand it- you might know about it- but it offers dozens and dozens of tutorial- on all things Adobe- I got a dual screen- watched the lessons on one and practiced on the other.
Thank you, Julia! I have been going through them little by little. It's a huge help!
You will take to it, like a girl to the animal float! I concur with Julia's info on Lynda's site. You can also ask about anything in question form on Google and find some kind of tutorial to help you:)