Do you HATE cropping each individual alpha that you have created? So do I! But I discovered how to let PSE do at least that much for you. Click on the image to read how to get it done!
Unfortunately, the process flattens each image, so you will need to delete the white background, but I think this is still easier than the cropping process! Have fun!
Royanna Fritschmann's white tag is what is being used in the image below for my alpha.