Less than 1 week –
Less than 10 hrs/week –
I volunteer with youth non-profit group (a soccer club) that switched domains last year. We've just been using the new domain as a Domain Alias, but we'd rather migrate everything to the new domain the right way so we can use custom cnames for the apps on the domain people know. There are about 20 users on the account. Some groups too, but those are less important.
I think I could do it myself (and can assist you ...