Stage 1: Playing with swatches! If I'm having a bad day, all I have to do is go meandering around the paint swatches at Home Depot. Perks me right up. Is there anything better? Perhaps if there was also a Dairy Queen in the paint aisle. That would be better.
Stage 2: Prep. Not so fun, but still kind of exciting. Decluttering, dusting, generally making a blank canvas for the upcoming masterpiece! Some try and over do it with a lot of masking and dropcloths. I mostly cross my fingers and hope it doesn't fall on the carpet- or my shutters. So far, my painting karma has been very good.
Stage 3: That first roll onto the sheetrock. Bliss!
Stage 4: (followed shortly after Stage 3) A violent hatred for painting.
Stage 5: Losing any and all will to live. Especially when the room is half completed, and what you have done is patchy at best.