When the world made a massive shift to work from home in an effort to limit or diminish the spread of the pandemic, there was an aggregate sense of anxiety and impending disaster. How could we possibly switch to working from home?
This is not an all or nothing science. Every acoustic element you integrate will add some layer of improvement and if you are not at a stage of rough framing the area in question, you may want to start small and work your way up. Whether it is before or after construction, the bottom line is that you can improve what you have.