Hi,
As far as macrium reflect all one needs is the recovery cd/ flash media or winpe recovery media to be able to create or restore a system image
I've been using it primarily to create and recover system images for nearly a year
Best to get familiar with the recovery process you will eventually have to use it
Create Backup Image with Macrium Reflect by Britec - YouTube

One quirk with creating a system image in the recovery environment is one needs to create a folder on the hdd you want the image to be on first.