How do I replace ignition switch '70 Dart Swinger

Great, Ill go and grab a puller. Is it OK for the splined column to come in or out a little. It moves when I try and pull on the housing. I hope I'm not messing anything up in my power steering.

Download a copy of the FSM for 1973 Dodge (or 1970), it shows the puller and how it attaches the column. Download FSM here: MyMopar - Mopar Forums & Information - Service Manuals