It depends on the specific model. Takedown procedures vary between firearms, but the one thing which remains consistent throughout it to remove the magazine, pull back the slide, and visually inspect...
Well, neither is a trap gun. They are both most appropriate for Sporting Clays. Trap guns are typically heavier and have a higher distribution of shot above the line of sight than a Sporting gun....
Remove the bolts, nuts, screws and other fixtures used to hold it together. Due to the broad scope of your question this is the best answer I can give. there is a lot to do to a car to disassemble...