Automating a mix shouldn’t be a daunting task to do. My method doesn’t interrupt one’s creative process and I am able to make it sound like the way I wanted to for each part of the song.
My technique for this is using the Latch Preview mode, using the global automation mode, and a cycle action I built to make it all possible with a single hotkey. In the past, automation was a taxing thing to do which takes me out of the creative flow. However, it’s now something I enjoy doing. I used it on music mixing and mastering as well as in my video production.
Read more about this here: https://reaperblog.net/2019/04/automating-song-sections-fast/