Photo by my friend AM showing some of the guides cutting steps on the front of Fox Glacier, New Zealand
Nothing can really prepare you for what it feels like to walk on a glacier. The crunch of your crampon in the ice, the ridges and crevasses you pass on your ascent, and the rapid change in scenery from dirty ice to suncups to firn are all unfamiliar to most people. Best advice I can give you is to go with a guide, do not approach the glacier front, especially areas where ice is hanging above you (it will soon fall).
Plus they can help you out with more unpredictable events, see YouTube video below: