Safely remove pc from domain

How do I ensure that I can login to an admin account after removing a PC from a domain?
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When you leave a domain, Windows ask for credential you can try with the local credential to be sure.

Otherwise with an admin account you can change the local admin password
The best practice will be to dis-join the machine from the domain while you are in a local admin login..  This will also ensure that the local admin credentials are know to you and you will be able to re-login to that system with the same credentials once the machine is out of domain..
!!!before disjoining the domain!!! make sure the local admin account is active - it can save you quite a headache, local admin accounts are usually disabled by default. when logged in as domain admin go start>run and enter

control userpasswords2. hit ok

go to the 'advanced' tab then hit the 'advanced' button. open the 'users' folder, right click 'administrator>properties, untick 'account is disabled'
while you're there you can set the password for it, just in case you can't remember what it is

after that, disjoin as above comments

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Windows 7

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