I love working with electricity and circuitry. Ifixit has thought me a lot on how to fix things in ways I would never have thought of.
iPhone 5s Display Assembly
the battery connector was (for me) extremely hard to remove. I broke the socket completely off the board hand had to hard solder it directly back.
i found that the T2 torx screw forks much better and fit more accuratly then the T3.