I'm gonna go out on a limb and guess that you're referring to a Popcorn or Acoustic ceiling. If so, read on.
Read these links. Deep, down inside one of them, I've included a link on 'How To' do this job. BUT, before you do, read through them all.
Popcorn Post I, Popcorn Post II, and Popcorn Post III
Other than that, my best to ya and hope this helps.
PS: After this afternoon, I won't be back until Monday, 9/18 but 'others' will be around ...
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