Coins at rest are not at risk.
What does this mean? Coins at rest? Like if they are cold-storage?
Coins at rest means that the coins are not being transacted. This could be in coins in cold storage or just that you are not making or receiving any transactions. Any coins that are from a transaction that was confirmed before the fork or are sent in a transaction that was confirmed before the fork are fine. However any coins in an unconfirmed transaction during and after the fork may not be.