Upon announcement an army of millions of rednecks and gun nuts (this is a US perspective. If you live outside the US I guess you politely ask them to stop?) would descend on the zombie hordes and mow them down for sport. The last zombie in the US would get picked off by a 7 year old girl from Louisiana wielding a modified AR-15 with an extended magazine and laser optics. All the zombies in Canada would freeze in the Canadian winter and just kind of turn to mush, and all the zombies in South America would get cut down in the narrow alleys of the barrios by well armed cartel members.
Any zombies lingering in the wilderness would be easily hunted and consumed by various forms of wildlife.
The only thing you have to plan for is disappointment, because the zombies would be long gone before they reached your neighborhood.
Or in other words just continue planning for your day to day life as usual.