Well, I'm not a blipper, and have never had any troubles changing down, though I know some do blip, I was never taught this.
I sometimes had the opposite problem of wheelspin, but never lock the rear!
Should one blip, can one be arsed? Is it really necesarry, in my measly 7 years of riding I've never found a use for it, just close the throttle, change down and all is smooth. I often use downchanges for engine braking which helps, and co-incides with the whole slowing down process.
and by the way, i want to make my 98 bird accelerate faster, thinking of downsizing the sprocket, any other ideas??? Already tried an iggy advance, but in the winter it idles like poo, so took it out.