Proper way of applying pattern??

[snook305]

HEy I was wondering if anybody can explain the proper way to use the pattern filter?
I have some textures like wood etc... and would like to change out a wall in an image with the wood,brick patterns. How do I duplicate the texture fast to cover a whole wall for instance with that pattern? And more importantly so it looks natural the joining points.
Is there a way I can make a selection of the wall which is maybe plain cement and I want it brick and I have a brick texture but much smaller than the wall and DPI of the image?
Hope that makes sense,
Snook

Thanks for any help.