2007 MacBook: Don't let a good thing go to waste.
1 - 2 horas
The LCD on my brothers MacBook cracked after he kept slamming it shut. I'm not sure what he was so angry about, but it's not exactly the smartest move- you really need to caress these things.
It took 2 hours and 45 minutes to take apart and put back together. I was nervous at first to take the computer apart, but the instructions were unbelievably clear (thanks ifixit). I used post-it notes with the step number written on them to keep the screws organized; it worked really well for me. I followed the instructions backwards to put it all back together, which I thought was going to be a pain in the ass but turned out to be just as easy as taking it apart. I did have one problem, I stripped one screw in the battery compartment by mistake; there wasn't enough room to get the screw back. I think that was step 3 or 4- I'm going to need to use pliers to unscrew it if I ever need to.
Follow the instructions, they know what they're talking about. Be patient and gentle, these things aren't exactly indestructible. Clear your schedule: I found that not having anything else on "my plate", so to speak" really helped me not freak out when things took more than 30 seconds.
I got the Matte screen, which was a great choice considering windows exist. I would use ifixit again.