I already read a few questions on tag-manager such as "What is the difference between google tag manager and google analytics?" but haven't seen a question about going from a site already using Event Tracking hard coded to using Tag Manager.
I'm actually redoing the entire website right now from a design perspective to make it much more focused and relevant to our users. As I proceed I'm not sure if I should implement the same Google Analytics I was using which was fairly extensive, or switch to Tag Manager.
I don't do any reports or A/B Testing currently since we're not an eCommerce site. I track all pages as well as some custom events I created to know when someone watches our videos, clicks-through to a dealer website, or downloads a manual.
What steps and considerations should be made? My main goal is to not mess up the existing data.