Start any big task or project by breaking it up into smaller tasks, iterating until a task can be achieved in a day or two.
At the start of a project, complete one task right away to get an early win keep motivated
Once an unpleasant task has been put off long enough, jump into it, attack it, tear it up, eat it, beat it!
Write all the tasks down--even if it's a long list, being organized creates a sense of control
If something isn't working or isn't clear, analyze it. The time spent will be worth it to get a longer-term solution
In working with other people, try to understand what they want--people have a reason for their behavior.