As I said, something new, a new institution like the Scottish Parliament.... Their voting system hasn't changed. It has been the count system since it was created in 1999.
Turnout is actually up. This year, at the last Scottish Parliament elections, the highest number of voters ever turned out and cast their vote, so that is positive.
For some other changes.... I suppose the biggest change has been around council elections, local government elections, where it was a very significant change from first past the post, one-ward-one-councillor, to the STV system. That was introduced relatively quickly. It was proposed during the term of the council, but by the time the next election was due to happen, in 2007, the change had been introduced.
We had to spend a fair amount of time in the run-up to the election explaining to people that they were to use numbers and not crosses, but we also highlighted that if they did cast their vote with just a single cross, that would count as an expression of preference for their first preference candidate. That helped with the transition.
Yes, it is possible to make the change fairly quickly, as long as there is plenty of time to discuss with people how they cast their votes and how they can ensure that their vote counts.