A couple things I do that help… when I remember to do them! 
1) Commit to 5 minutes. Once I get started I usually do a lot more than 5 minutes work.
2) Reward substitution: reward myself with something I like (i.e. food treat, hot bath, etc.) for completing the work that I don’t like doing.
I give credit to my wife for the first idea.
I give credit to Dan Ariely for the 2nd idea.
http://www.youtube.com/watch?v=uvvQrqIRLGU
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