Set up contingency plans to fall back on. Plan for upgrades and for your staff's outgrowing the technologies they have. Know that change is a painful process and be ready for the bumps in the road to success.
Good communication is essential in the process.
People come before technology. Take a step back from things every once in a while to view the overall picture. Don't take yourself too seriously. Know when to say when. Don't promise what you can't deliver.