taking off the TB is only 4 more bolts to do (after removing the maf) You don't need a new gasket so long as the one on there is in good shape...which it should be, but you cna pick ont up fro mford if you want just to be sure. There's no way in hell you're going to get the back side of the plate clean, unless you pin the tb open completely, which would mean redlining the car, and spraying for a very long time. Seriously, that stuff needs to be taken off with some elbow grease. I spent a good hour on mine and there's still some carbon that won't come off.
