Time Period for Windows Live Mail to eM Client Import

I would like to install eM Client on a computer that is currently running Windows Live Mail and set up the same email account being used by WLM. Then I would like to delay the processing of any email by eM Client for a period of a few days and continue using WLM during that time while I slowly and carefully import all WLM folders to eM Client. When I’m satisfied that the entire WLM environment has been transferred to eM Client, I’ll stop using WLM and start using eM Client. Is it possible to do this, and what steps and settings are needed?