When I was a kid a few years back I spilled a smoothie on the keyboard and that's when things went downhill for my keyboard. The keyboard developing a disgusting finish and the S key became loose and inoperable. I got the laptop when cleaning out a storage vault recently, and decided to replace the keyboard for the heck of it.
I was fortunate enough to find a youtube video that showed how to replace the keyboard on my specific model, so the repair went off without a hitch. The part I was most worried about was the ribbon cable holding the keyboard to the motherboard - it was fragile and delicate, and if I messed it up I'd have to get another replacement.
If there is no guide for what you are doing, ask around and do some googling. It may take some time and effort, but the reward of being able to repair a computer is very satisfying.