Here's a bold proposal: Why don't we seize Baghdad's civilian and military airports and fly our supplies ... C-130 and C-17 direct to YOU! Operators are standing by.
There will be no extended guerilla warfare in Baghdad. The citizens are currently non-committal because Baghdad is controlled by Saddam's sociopath butchers, also known as "House Security". They may use the domiciles and businesses of regular schlumps for safe houses, but that request usually entails threatening the immediate execution of the nearest family member as a persuasive closing technique. If a rifle-weilding guy wanders from a house into the middle of a Baghdad street in full view of Force Recon, Ranger or British SF guys ... they just might shoot up the doorway of the building he just emerged from.
Guerilla warfare requires a greater population invested in the survival of the government or regime. Nobody in Iraq, besides the war criminals liable to hang anyway, is going to willingly fight for Saddam Hussein. They're out there fighting at the barrel-end of a gun. A gun weilded by the guys who need to get their ongoing protection and sanctuary.
It won't happen. Saddam forbade his Revolutionary Guard regulars from entering Baghdad BECAUSE he feared a violent overthrow of his regime. It's like the SS, Gestapo vs. the German regulars who took thrill filled and chronically fatal business trips to Turkey, Anzio, Tunis, Stalingrad, the bottom of the North Atlantic minus the U-Boat and the doozy of a landing crash pads of Belgium, France and the English countryside.
Berliners wouldn't support the sanctuary and guerilla operations of Hitler's henchmen. Sans Hitler, when the end was near? Pffffft! The shiny black booted guys were the folks who scared the hell out of everyone and made people disappear.