Excellent guide, this made it easy.
The only thing I struggled with a bit was to reconnect the battery cable. You have to do exactly the reverse of step 5: first fasten the part of the battery cable connector that has the cables connected to it (= the part the closest to the battery), so the black cable connector is tilted slightly. Then gently push the other (titled) part down until it clicks. Ensure the connector is fixed before re-assembling the back cover.