This is a video I made to explain how to make patterns with multiples of the same picture. I will duplicate this little cat and when I change it, it changes all the copies too!
I can't say the video is professional and perfect, but I hope it will help you work more efficiently.
This tutorial is for people with basic understanding of Photoshop ( as in : you know how to use layers )
And, hum. I apologize for my awful English!
See it in a better resolution here: