I've only had to change the battery on one other car. My Skoda Octavia at 8yrs old had the original battery die. So, Haynes manual was consulted for the change, and relevant parts highlighted in preperation for relaunch sequence. Low and behold, absolutely no need. As other have said, speed is the key. The car ends up without power for <2mins.
For reference, even though our Jazz has only been with us for a month and 1000 miles, to my ear it was turning over a little slowly. Almost like the starter motor was not giving its all. Well, with the new battery, the starter motor is turning much faster.
So pleased to have done this now, rather than in a few weeks time when the cold weather arrives. £37 well spent.