Windows 2003 upgrade

I am about to upgrade our domain from w2k to windows 2003. I got this info from Tech Republic:

Begin Paste -
1. Log on to the schema operations master role with an account that's a member of both the Schema and Enterprise Administrators groups. Make sure you've enabled schema updates.
2. Create a directory under the system drive's root with the name IOP.
3. Open Notepad, and paste the following text:

dn: CN=ms-Exch-Assistant-Name,CN=Schema,CN=Configuration,DC=X
changetype: Modify
replace: lDAPDisplayName
lDAPDisplayName: msExchAssistantName
-

dn: CN=ms-Exch-LabeledURI,CN=Schema,CN=Configuration,DC=X
changetype: Modify
replace: lDAPDisplayName
lDAPDisplayName: msExchLabeledURI
-

dn: CN=ms-Exch-House-Identifier,CN=Schema,CN=Configuration,DC=X
changetype: Modify
replace: lDAPDisplayName
lDAPDisplayName: msExchHouseIdentifier
-

dn:
changetype: Modify
add: schemaUpdateNow
schemaUpdateNow: 1
-

1. Save the Notepad file with the name InetOrgPersonPrevent.ldf in the newly created IOP directory, and close Notepad.
2. Open a command prompt, and change directories to %systemdrive\LOP.
3. Type the following command, including the quotation marks:

c:\iop>ldifde -i -f inetorgpersonprevent.ldf -v -c DC= ""

Replace with a case-sensitive constant (dc=corp,dc=tailspintoys,dc=com), and replace with the domain name path for the root domain of the forest.

End Paste -

I am completely lost with this starting with step 1. How do you log on to the schema operations master role? I assume that step 2 simply wants me to create the folder c:\IOP?

After the first 3 steps there are 3 more steps. I'm confused as to how to determine what I replace the and ? Is there a command i can run to determine what these things are.

Part of my Exhcange System Manager looks something like this if it helps any.

Callenders (Exchange)
- Administrative Groups
- Corporate
- Servers
- SVEXCH

My domain is simply MCCALL.local

Any help would be greatly appreciated.

Thanks