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You can speed things up by making the default setting for new tasks be set up as "fixed duration" tasks. To do this, create a new task and change its setting to fixed duration and while the task is still selected, go to "Project" > "Set as Default for New Tasks". Now, ever task that you create will automatically be set to fixed duration.

To speed up the assignment part, you can select multiple tasks and go to the "Task : Assignment" inspector. As you check each resource it will be assigning them to all the tasks in your selection.