I need some informations about the best "update path" for Windows XP SP2.

We have XP SP1a clients with ZENworks 6.5.04 Agents. We are using Group
Policys, created on a XP SP1a machine.

Because of the problems described in TID10095342, we have created a new
Group Policy on a XP SP2 machine.

Are these the required steps for the SP2 rollout (in this order) ?:
- deploy ZENworks
- unassign the SP1a Group Policy
- reboot
- Install SP2
- assign the SP2 Group Policy
- reboot

Do I have forgotten something, or is this the wrong order? Are all these
steps necessary, or can skip a step ?

Thanks in advance,