5 - 15 minutes
My battery has been lasting for less and less time over the last few months while performing the same tasks and so I decided to replace it.
The replacement was super easy. The iFixit guide was helpful but it was a simple screw replacement and then making sure the long screws went back in the long holes and the same for the short screws.
Nope, the tutorial was very easy to follow and covered all the steps. Thanks guys!