Matt---You paint the dash the same way porcupines make love------very very carefully. I have done this a fiew times, with good success. Remove everything that is easy to remove like seats, carpet and seatbelts if you have them. Leave the headliner alone, They are a bitch to put back in right, remove all the garnish moldings around the side windows if they are the type with screws holding them on(they can be set up on sawhorses and painted outside the car). Forget about the grease--it just makes an ugly messs----Spend a great deal of time masking everything including the gauges---remember that masking tape comes in a variety of widths to make your job easier. Either mask off the sidewindows, or, if the exterior of your car has yet to be painted, just roll them down and mask off the slot at the top of the doors. Buy some "prep-sol" or its equivalent and wipe down all the surfaces that you want to paint before sanding---that way, if there is any silicone contamination (from hand creams, etc,) on the surfaces you won't be forcing it into the micro crevasses created when you sand. Sand everything with 320 grit paper, dry sanding is fine, water just makes a big mess inside. You don't have to remove all the paint--just sand enough to remove the shine or gloss from surfaces to be sprayed. Wipe again with "prep-sol" before you spray your paint. Time and preperation are what really make the difference here, as in any paint job. You can use a rattle can, or if you have it one of the door jamb touch up guns with the half pint cup works well. I have even used a full size production spray gun, but you don't have as much room to manouver it inside a car.