The folks at Rapid Repair recently took apart a new PSP Go, and took a look at its insides.  The instructions are on their website complete with a bunch of pictures.  You can click on them and see all the details.  If you are doing a repair on your PSP Go (read this statement:  IF YOU ARE DOING A REPAIR, YOU WILL INVALIDATE YOUR WARRANTY), check there for the step by step on how to crack it open without busting it.

http://www.rapidrepair.com/guides/psp-go/psp-go-repair-guide.html

The original article can be found here.