If you get a hard cover for your PSP it will protect it. Using a hard cover will not ruin your game.
use bluetooth
Open the PSP's back cover, place the UMD into the slot, close the back cover.
No
there is a tutorial in the Related Link below.
A screen cover will help your protect your PSP since you are able to protect it against various scratches when it comes to items that will come into contact into the PSP.
No why would it
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I believe you are talking about the button that releases the battery cover, so you can get to the PSP's battery.
If one wishes to purchase a Snoopy PSP cover there are several retail outlets available. Online they can be purchased at Mobygames and The Cover Project. They are also available at Sears, eBay and Amazon.
Step 1 Turn off your PSP by sliding the power button up. On the back, a battery cover covers the PSP battery. Remove both the battery cover and the battery.Step 2 Remove the two screws located underneath the PSP battery, and place them to the side. You will remove five screws total. Unscrew the two screws on the opposite side of the PSP battery. Remove the final screw on the bottom edge of the PSP.Step 3 Grip the PSP from both sides and gently pull the front cover off of the PSP. This will display all of the inner workings of the PSP, including the analog joystick assembly. Lift the joystick assembly out and up to remove it from the PSP.Step 4 Locate your new joystick assembly and snap it into the spot where you removed the old one. Place the cover back onto the PSP and replace all of the screws that you removed. Place the battery back into the PSP and snap the cover into place.
Yes you can, many places will give you a PSP in exchange for a DS, and a sum of money to cover the difference.
There are several different options for PSP screen protectors. One can choose a clear crystal hard case cover or a protective guard LCD film. The LCD films usually come in a multiple pack in case they get damaged.