Replacing WFE testing

Putting together a testing plan for replacing an WFEold with WFEnew. Related to previous post https://social.technet.microsoft.com/Forums/office/en-US/1ac34343-7caf-4d6b-b69f-021d1c143572/replacing-wfe-wsps-14-lb-other-customizations?forum=sharepointadminprevious#05cd1ed3-c3cc-407e-8363-42cc1cfbab36.

WFEnew has been added to the farm, but no services are currently running.

I'm thinking that in off-hours:

1. set tester's hosts files to point to WFEnew
2. start services on WFEnew currently running on WFEold:
   Central Administration
   Microsoft SharePoint Foundation Incoming E-Mail
   Microsoft SharePoint Foundation Web Application
   Microsoft SharePoint Foundation Workflow Timer Service
   Search Query and Site Settings Service
   Secure Store Service
   SharePoint Server Search
3. turn off WFEold
4. Examine GACs C:\windows\assembly of WFEold and WFEnew, see what is missing (is the GAC automatically updated whth Web Application service is started on WFEnew?
5. Spot check of SharePoint sites and custom applications.

Anything I should add? Anything wrong with my thinking/approach?

Thanks,

Scott