How to remove a background and leave the subject? (2nd attempt)

Question

Hello all, new user here.Please notice the enclosed images. I need to subject them to two processes, in order to prepare them for a before/after slider.(1) Align them as precisely as possible. I already found out about setting the opacity level, scaling and shifting the image on top.(2) For the second image I need to remove the background and replace it with transparency (*). I have seen several videos in YouTube showing how this is done. There seems to be several techniques and I figure that for the specific image attached perhaps there is an optimal approach?
 
TIA,Travis Banger
(*) Since I require transparency, the image should be saved in the PNG format, correct?Note: The images were removed since the moderator does not seem to approve of forensic cases?
The images are attached. Please do not click if you are sensitive to forensic/medical material.

Nancy OShea · Answer

Image #2.This is one way to do it.Unlock background layer with a double-click.Use whichever selection tool you're most comfortable using.  I used a Quick Selection Tool on the skull. The styloid process is a little tricky.  Use add/subtract selection to get what you want.  Or you can refine your selection in Quick Mask mode (Q) by painting with a brush or pencil. When you're happy with your selection, exit Quick Mask mode (Q).Go to Select menu > Inverse (Ctrl + Shift + i).Hit the backspace key to remove background.

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