While this is certainly permissible, it is generally better to use only one or two key Milestones for this process. If there are many small actions that take place in a short period of time, then you may wish to have a SPoC consult with Support. Many churches have found it more convenient to exploit the ability to add fields to the Participants page to create a simple list of steps that any user can easily manage right on the Participant record (e.g., initial call made (yes/no), attended orientation (date), pastor call made (yes/no), references checked (yes/no). 

 
Q2: How do I take someone out of a Journey?
From the Milestones Assigned Page, select the last Milestone they were assigned on that Journey and set the Discontinued Journey field to Yes.