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The step forward once space and attack is a single action for the GS costing 1 AP, so you cannot interrupt between the move and HtH attack.
By guard mode do you mean Overwatch? I think you have to go into overwatch during your own turn. Command points can be used to clear jams and restore overwatch during the GS turn.
It would be a bit late to go into overwatch after a GS has attacked a marine, you only get to fire at models that are moving in LOS in overwatch, not performing actions like attacking or opening doors. The exception being that opening a door or attacking+killing a marine exposes them to LOS of another marine. But once into HtH the marine have to fight it out with their powerglove, they don't get to fire at the GS every time it attacks.
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