+1 on the T4 screwdriver. I did fine with T3, but only because I have a really good screwdriver set. I tried T4 after reading this guide and indeed it fits way better.
One little note - when starting to pry, start with bottom right (as the screen is facing you) corner. Be careful not to thrust your plunger into the middle, where the tiny mic hole is - the plastic body has a tiny bit of oval padding, probably to soften the mic sounds and prevent the case from covering the hole, if you go too hard you may strip that piece of padding.