You don't mention it, but Dell puts the service manuals for their laptops online, which can really help. For example: http://support.dell.com/support/edocs/systems/ins5100/en/sm/

I had to replace the keyboard on one of my Dell laptops, and while I would have been able to do it without the manual, it was very nice to be able to just follow instructions and know I was following the minimal path, rather than disassembling everything, with the attendant screw-loss risks.