Guys, I need help to those who have replaced their stereo head with another unit.

Here are some of my question:
1. Would a double din unit head fit?
2. How do I pull out the head unit? A friend of mine has an F150 and he indicated that his head unit has a bunch of holes to remove the unit.
3. I would like to ask if you have or anyone have any documentation on the removal of stereo head units, electrical, etc,

Thanks.