Easier Nova Prospect
After using the turrets the first time, you can take one with you to the next part. Simply use your gravity gun and fling it where need be. Upon arriving in the jail like area where you must defeat seemingly endless combine soldiers waiting for Alyx to arrive, set up the now 4 turrets in one of the cross hallways. Put two on each side. Arrange them so that they have cover but can easily shoot out. For example, put one in the left corner, facing to the right so that enemies coming from the left can't flank it. After completing this part, you can take one of the turrets with you again to make the next part easier. While in route to the next standoff, place the turret in the open occasionally to easily pick off combine while you take cover. When arriving at the portal, you will again have 4 turrets, enough to cover all entry ways of the combine.
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