Best way to apply a new ACL to an interface that has a ACL already applied

Hello All:
I am in the process of cleaning up an ASA 5510 that I have inherited and have a question about applying a new ACL to an interface that is working correctly now with another ACL. The main purpose is I want to change the name of the ACL an clean it up a bit. Also would making this change cause an outage of more than a few minutes?
For example let's say I have the access group below:
access-group dmzif2 in interface dmz
With an ACL:
access-list dmzif2 extended permit tcp host 10.73.95.200 host 10.73.77.41 eq smtp
access-list dmzif2 extended permit tcp object obj-10.73.95.0 host 10.73.77.42 eq domain
I want the new one to be:
access-group DMZIF_IN in interface dmz
with ACL:
access-list DMZIF_IN extended permit tcp host 10.73.95.200 host 10.73.77.41 eq smtp
access-list DMZIF_IN extended permit tcp object obj-10.73.95.0 host 10.73.77.42 eq domain
Can I just add the new ACL's entries and issue this statement?
access-group DMZIF_IN in interface dmz
Any help is greatly appreciated!
Dustin

Thank you for the reply, so once the new ACL is created an added, would this be the correct commands? (sorry this is in production and I don't want to screw it up)
So add these lines:
access-list DMZIF_IN extended permit tcp host 10.73.95.200 host 10.73.77.41 eq smtp
access-list DMZIF_IN extended permit tcp object obj-10.73.95.0 host 10.73.77.42 eq domain
Then run:
no access-group dmzif2 in interface dmz
and then run:
access-group DMZIF_IN in interface dmz
and all should be good to go? Also after that how do I remove the old ACL's? with "no" in front of each line, or is there a command to clear all in bulk?
thanks again for the help!

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Best way to apply a new ACL to an interface that has a ACL already applied

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