1. Get the Right Kind of RAM

Depending on when you purchased your computer, you'll need to either purchase 1066MHz DDR3 SDRAM, or 1333MHz DDR3 SDRAM for the recent refresh. To find out, you can look up your Memory specifications in the System Profiler going going to the Apple Menu > About This Mac > More Info… and then selecting the Memory category under Hardware. You'll see the Type and Speed of your RAM prominently displayed.

Before you purchase, also remember to look up the type of MacBook Pro you're running under Model Identifier (available in System Profiler, under the main Hardware category).

Sites like OWC and RamJet have easy upgrade kits...

You could also purchase your own mobile memory from sites like NewEgg.

2. Remove the MacBook Pro's Bottom Cover

You'll need a Phillips #00 screwdriver to open up the MacBook Pro. As you remove each screw, place them into a cup or plastic container to hold on to them while your MacBook is open. There are 10 screws in all, with three longer ones that bind in the hinge.

Once you lift off the bottom of your MacBook Pro, you'll see the RAM blankly staring at you. It's right there, above the battery and next to the battery switch.

3. Unhook the Battery for Added Safety

The battery switch looks like a little tab with wires coming out of it. Carefully unhook this with your Spudger...

...then lift it up with your finger, being sure not to touch anything else on the motherboard.

4. Pop it Up

Simultaneously push outwardly on both of the tabs that seal in the RAM. It should instantly pop up out at you.

Carefully pull the RAM toward you to remove it. You might need to push out the tabs to get the memory module seated on the bottom to pop up further, but it's essentially removed the same way.

5. Plug It In

Carefully push in your new RAM into the slot, essentially reversing the way it came out. Make sure it's properly seated, then gently push down on the RAM in the middle of the module. You'll hear a slight click when it's locked in. Follow through with the second stick of RAM and remember to push it down.

When you're finish and both RAM modules are in, make sure that the tabs on either side have them sealed.

When you're all finished, reconnect the battery, then seal up the bottom cover and turn on your MacBook Pro. The OS will recognize the new RAM speed under "About this Mac."

Be forewarned that if your Mac isn't turning on at all, that means the RAM isn't seated properly. In this case, you'll have to repeat the steps necessary.