Yes has me start on it and either complete it or hit a snag. If it's a snag, then I'll analyze it briefly and then go back to procrastinating until the subconscious has worked out another approach.
No is perceived this as a feeling of "Nope." I've attuned myself to this feeling and have learned to listen carefully to it. Many, many times, especially with work tasks the reason for doing that particular task will have evaporated by the time I'm ready to do it.
Other times I find I needed to clear my mind before the subconscious can present to me the right way to go about it. So I'll read articles so as to purge my mind of the attachment (in the Buddhist sense) I'm feeling to the task.
Sometimes it takes days / weeks / months for this attachment to clear up. I have a task I've been wanting to do sit in my reminders for 2 months now. It will stay until I'm either comfortable removing it or actually doing it.