I've skipped those steps I've explained in earlier posts. just one closer look on how you overlay the brush on your blue channel copy

Now once you've made the layer mask... make sure layer and mask are locked... select move tool and drag it to new wrokspace while holding the left mouse button.

Next step is refine edge
TIP: its alway better to choose the background image before refining edge.... cause image extracted from lighter background/placed on a lighter background don't need to much work... and same goes for image extracted from darker background/placed on darker background.
when you open the refine edge option, it will show you the marching ant (selection area) and you won't be able to see the edge clearly.

simply pressing Ctrl+H will hide those ants and give you a better preview. Slide down the mask edge (to left) till those halos go away, then use a light bit of feather to soften it

Thats it you are almost done.

At last add some shadow under the characters to make it more realistic.

I hope you got the idea
I've skipped those steps I've explained in earlier posts. just one closer look on how you overlay the brush on your blue channel copy
Now once you've made the layer mask... make sure layer and mask are locked... select move tool and drag it to new wrokspace while holding the left mouse button.
Next step is refine edge
TIP: its alway better to choose the background image before refining edge.... cause image extracted from lighter background/placed on a lighter background don't need to much work... and same goes for image extracted from darker background/placed on darker background.
when you open the refine edge option, it will show you the marching ant (selection area) and you won't be able to see the edge clearly.
simply pressing Ctrl+H will hide those ants and give you a better preview. Slide down the mask edge (to left) till those halos go away, then use a light bit of feather to soften it
Thats it you are almost done.
At last add some shadow under the characters to make it more realistic. ;)
I hope you got the idea