Define a minimum time during which you are going to work on a large but unpleasant task. During this time frame you are not allowed to move out of your chair, make a call, surf the net, etc. You only focus on this one task.
Even if you cannot complete it in one time, this approach makes sure that you can make major progress. After a few sessions the task will not look that terrible anymore and you change to a more positive attitude towards this task.
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