Comment by Volundr

> Yet people with experience know that Step 2 requires orders of magnitude more effort and time than Step 1.

And also that the steps here should be reversed. Sure if you are tearing down a building you destroy before creating, but systems aren't buildings. If you are going to create a new system to run the cash registers for your business you don't tear out the old one and worry about building the new one later. First you have the replacement ready THEN remove the old one.