While confident that the rollover will cause no severe problems, federal officials are taking final precautions nonetheless and offering last-minute advice to help Americans sail smoothly into 2000.

Hoping to ease the transition, officials are getting benefit checks for veterans and Social Security beneficiaries to the Postal Service early, in order to ensure on-time delivery. They are also advising citizens to keep emergency numbers and battery-operated radios handy. And they are shutting down some public Internet sites to safeguard against hackers.