Slowly and gently lift the top edge of the front panel assembly away from the steel inner frame.

Continue to rotate the front panel assembly away from the steel inner frame until it slowly begins to peel off the adhesive applied below the home button area.

It may be easiest to insert a spudger at the top and work it around the edges, spreading gently as you go.

Carefully pull the lower edge of the front panel assembly away from the steel inner frame.

Be careful, if the home button sticks to the front panel you may tear the home button cable.

Do not pull the front glass completely away from the frame. Doing so may result In damage to the digitizer cable.

If the glass is cracked (which it probably is since you're replacing it) removing the panel is likely to cause it to bend, kicking off small shards of glass. Before you do this step, cover the front with clear tape, then perform the actual removal over a trash can. Protective eyewear would also be prudent.