Macbook Pro (Early 2011 / MacBookPro8,2)
Needed to replace my battery which was at this point drop dead (after 2 years) - causing a lot random shutdowns.
Way more simple as the Superdrive/HDD replacement i did months before.
Buy the right tools that the guys here provide.
If you need help? Follow the descriptions provided here.
Most of the repairs are easy... (maybe... the replacement of the Homebutton of the iPhone might be more for talented tinkerer).
Phillips #00 Screwdriver
Tri-point Y1 Screwdriver
MacBook Pro 15" Unibody (Early 2011-Mid 2012) Replacement Battery