One thing that really has helped me with e.g. writing an email that I dread writing is to just write a draft that I don't plan to do anything else with than use as a starting point when I write the real email that I won't write until tomorrow. Often the draft is good enough to send after only small edits. Or the writing of the draft have helped me to clarify my thoughts enough, combined with a night of processing, that writing the real mail the next day becomes relativly easy.