Do you word in whatever size. Click "Animate," to get a text timeline, create key frame at about one second. Copy that KF. Put the copied KF at Zero, (or whatever time you'd want to start, must be earlier than the orig).....with the key frame selected, shrink the Scaling down to nothing. This should work in virtually any text editor. You can further animate it with placement animation, either in the editor itself or using Track Motion.