It is still loud/noticeable, but definitely not as bad once the exterior is complete (and windows are installed). I second the suggestions for noise-cancelling ear plugs (comfy ones to sleep in and bluetooth for working). I will also say, you may adjust after a few weeks - I don’t get woken up anymore when it starts in the morning because my system is just used to it.

This is what works for me! Plus making sure to remove my coat - getting hot always makes it worse, so I wear layers when I know I’ll be Metro-ing.

I also recently went to NYC and was amazed that I felt totally fine on an hour-long subway ride, but so ill on the 2 stops back home on the DC Metro.