Optionally, undertake a preliminary risk management workshop right at the outset - even though all details may not yet be clear.  This sets a benchmark, and sends a clear message that risk management is taken seriously.

As one of the final steps in creating the project execution plan (detailed project plan) a thorough risk analysis should be completed.

At regular intervals, undertake risk analysis reviews to determine the effectiveness of any mitigation strategies, and to uncover any new threats that may have occurred.

Finally, make sure to do another thorough workshop at before moving into the implementation stage.  This is when there is a greater temptation to skip 'non-core' elements of the project, and it is often one of the riskiest parts of any project.