I bought the pro tech toolkit and liberation kit and set my work area to the longest one hour of my life. Everything inside the 4s is so tiny and fragile, I was in constant fear of breaking something, but the teardown videos and the comments on this page really help me to get through the entire process.
Thank you everybody and let us continue tinkering our way through all the adversities in this life! Peace!
At my first run into this guide my cable was defective, but iFixit quickly send me a replacement that arrive in 4 days in Sao Paulo-BR and voilá, everything works like a charm. Thanks to iFixit and I recommend to everyone this fix 'cause extra storage is always good!