Replying to To anyone that knows Mac's inside and out: I need simple repair help?

So i spilled juice on my keyboard and track pad, luckily i wiped it off quick enough so it did not cause any internal damage.  The keys and the mouse clicker are just super sticky and it is a real pain in the ass to use.  I took it to a computer repair shop and they quoted me like $200 to fix it, but they also told me exactly how they were going to fix it, he said he was just going to take the keypad out and soak it in hot water.

It is a 15 inch MacBook pro, it is two generations old (the generation right before they made the  black border around the screen)

So my question to anyone that can help is.  How do I safely remove the keypad and the mouse clicker thinger so i can just do it myself?  How many pieces is the casing made up of?  &  Can i just take off the plate that holds the keyboard and track pad?