Well that mission is tuff...as soon as you enter there will be red dots and you just got to go towards them and shoot at the window but i dont end there you got to run upstairs and shoot them too i would say try to use some cheats for this mission go at gamespot for cheats.
Let me help you explain a bit more on this game Challenge mode is where you fight other superstar in legend mode so it would be hard and why would you want to clear that section ? because you can unlock the legend superstar belts likeDusty Rodes. If you want to fight normal just enter exibition mode and fight there and if you want to make it easy game play then go on options and change the settings.