Changing Password on a SQL Server Cluster

I have a two-node SQL Server Cluster - Active/Passive (these are physical servers)
The following is the config/setup:

OS Name:                   Microsoft(R) Windows(R) Server 2003 Enterprise x64 Edition
OS Version:                5.2.3790 Service Pack 2 Build 3790
SQL Server Standard Ed. 64 Bit; Version 9.00.4053.00; SP3

I need to change the password of  the Domain Service Account that these two services are running under:
SQL Server and SQL Server  Agent

This is a production server; how do I proceed - lowest down-time.

Thank you.
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Schedule an outage for the time it takes for the SQL service to restart.

Change account / password, will not take affect until SQL service is restarted.

Could do the passive node first but there will still be a SQL outage during failover.
Also for SQL 2005 see ms doc:

Additional service account info:
DBA2000Author Commented:
my question is, specifically, from where do you change the PW, Active Directory?, the server's Control Panel services?, Using SQL Server Config Mgr????

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Change the account pw in AD and then change it on the nodes from the services applet.
DBA2000Author Commented:
These servers are in an Active/Passive MS Cluster. What are yu refering to as "services applet" To my knowledge, in SQL Server, you make changes from SQL Server Configuration Manger.  Am I missing something?

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DBA2000Author Commented:
The answer was not specific, too broad ... did not answer the exact question asked.
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Microsoft SQL Server 2005

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