
I have one simple suggestion that would take some time but the blizzlike resultes would be there for certian

For example you make 1st session just for starting zones 1-10 level:
Elwynn Forest, Dun Morogh, Teldrassil, Durotar, Mulgore, Trisfal Glades
After everything is tested and players report bugs and you fix them, then you release next 2nd session for zones that are in range 10-20/25/27 level:
Darkshore, Loch Modan, Silverpine Forest, Westfall, Barrens, Redrige Mountains, Stonetalon Mountains
Again after everything is tested and players report bugs and you fix them, then you release next 3th session for zones that are in range 18-35 level:
Ashenvale, Duskwood, Hillsbrad Foothills, Wetlands, Thousand Needles
And you repeat this process until you check and fix all other zones.
Of course you can change range level and increase/decrease zones that you will test in one session but this should be just one simple example of my suggestion

Good luck with your scripts
