Hej Niclas, We have some lefty sticks that people can borrow. If you have a phone with Esim, I recommend getting data via Airalo. Very inexpensive. Can someone coming from the DC/MD side give him a lift from a metro station or elsewhere?
Otherwise Google maps will show how to get there all the way via public transit, but hopefully someone will offer you a lift from metro. On the way back someone can certainly drop you at a metro.
p.s. Right handed Americans actually predominately shoot right. The theory is that it is because they are exposed to baseball first.