We've had 10 successful voting system reforms at the provincial level. We have a lot of experience introducing different voting systems, and we've had experimentation at the local level. My book looks at 18 countries across 150 years, citing every instance of voting system reform in western industrialized countries, so we don't lack for models of implementation.
There definitely are some dos and don'ts. On the positive side, you have to recognize that there will be a bumpy road to implementation. There will be a learning curve. As a former election administrator, I can tell you to swamp the polls with people who can actually help voters. That's where you run into the problems. As people adjust to a new system, they are going to need help. To have bodies on the ground, ramp up the budget for the first couple of elections and hire people to help. This way, you will not have serious problems.