Chapp,
How do you open carts so easily? I've tried numerous times but can't get the plastic to budge. How do I begin?
The short answer is: training.
I will try to be more specific though.
There are several methods I know of, but I only know one, which is safe enough. This method has two variants. I will only talk about these.
Both require the use of your hands. Avoid screwdrivers or metallic objects.
The first variant requires a soft surface, like a sofa for example.
If you take a close look at the tutorial Joneo posted, you will have a good idea about how the carts are made.
First, put the cart face up, the label away from you.
Then, if you are right-handed, I would suggest you start with the front right side. Place your thumbs to the very right of the cart, but on the front side. The other fingers grasp the cart tightly.
With your right thumb, press gently, but firmly, in order to release the "lock", while, with your left hand, you slowly "slide" the upper part towards you. This should open the first lock. You have to use both thumbs in order to avoid any damage to the lock.
Once you have done this, you can either try to release the lock which is just "up" from the first one, by doing the same with your thumbs, or take a plastic card and use it to release this lock. Once both locks are released on this side, take care of the opposite side by repeating the above method.
Then, take the plastic card, if necessary, and release the last locks on both sides. Be careful not to tear the label down.
This should do the trick.
Some tips:
I never open the cart "completely" in order to avoid to "mark" the label.
Some carts are easier to open than others, if you do this carefully, there should not be anything difficult about opening the cart.
Some people use a sheet of paper to open the carts, but I never managed to do so.
The second variant of this method is to do the opening without using anything but your hands and keeping the cart "in the air". This requires some strength but works wonderfully fast, once you feel the trick.
Hope this helps.
My advice still stands: train on cheaper or in bad condition games first.