Technical Site Migration

[Instructure]

Hello All-

I have been in the SEO industry for about 4 years and feel fairly confident in my technical SEO; however, I am being asked to conduct a migration that is both a platform change (step 1) then a consolidation change (think of combining websites when a company is acquired) all within a 4-5 month time span.

I feel like as I begin to create this multi-step checklist I would love to hear of others that have gone through something similar or have resources you could point me to form more of a process/procedure standpoint.

Again - I feel confident in the technical output but I have a fairly junior team and want to execute this smoothly.

Feel free to add recommendations or ask for clarification if my discussion question doesn't make sense.