Anything is easy to do when you know how to do it. And yes it is possible, but a lot easier if you have the psd files. If you don't have the psd files then you'll have to copy small portions of the botton your working on and paste the portions over top of what you want to cover. That's how I do it any ways, don't know about anyone else. Draw out a cut area as close as possible to the area you want to cover so it will hopefully blend in when you drag it over. Then go to edit and choose copy. Then go to edit again and choose paste. Drag it over to an area to cover. Then paste again and drag, over and over and over again until you get the area covered. Then when I finish covering the area I merge them all down. Give it a try unless somebody else has an easier way. Good luck.