EWTN Catholic Q&A
Question from Monica on 04-02-2005:

During the next 9 days of mourning for the Pope, are there specific things Catholics should do? Such as fast, pray, make sacrifices, avoid parties etc. Are we bound to do these things? or is it left up to the individual to decide what he/she should do?

Answer by Colin B. Donovan, STL on 04-03-2005:

You can use the prayers posted in a previous answer, but what else you do is up to you. I certainly recommend more prayer, and especially participation in any special liturgies in your diocese.