tl;dr
Step 1: Do the Thing

Step 1: Doing the Thing
Step 1.1: Identify the Thing.
Step 1.2: Determine the state the Thing will be in when it's Done.
Step 1.3: List the steps needed to Do the Thing.
Step 1.3.1: Add additional steps to account for unforseen happenings. These steps may be skipped in Step 1.4 if they are not needed to Do the Thing.
Step 1.3.2: Identify the additional resources needed to Do the Thing, if any.
Step 1.3.2.1: Obtain the additional resources needed to Do the Thing as identified in Step 1.3.2.
Step 1.4: Carry out the steps listed in Step 1.3 to Do the Thing. Skip steps as necessary, including steps added in Step 1.3.1.
Step 1.5: Confirm that the Thing has been Done. If not, then return to Step 1.3.
Step 1.6: Declare that the Thing has been Done.
Step 1.7: Proceed to Do the next Thing (refer to Step 1) or revert to the state you were in before Doing the Thing as explained in Step 1.

Revision History
17 APR 06 - Step 1 added
17 AUG 08 - Clarified wording in Step 1