I might have one big suitcase ( that will only have clothes, nothing heavy) and a carry on. How hard will it be for me to move in the metro area to take the rails and the buses ?
Hauling your suitcase might be a bit of a pain but, honestly, nothing is going to make that a considerably more or less pleasant trip.
You can use the metro trip planner to get an idea of times and routes.
If so, it_s a bit tricky, but here_s how to do it:
Take the Washington Flyer shuttle (leaves at 15 and 45 minutes past the hour) to the West Falls Church Metro station. Last I checked, it_s $9 one way and $16 round trip.
Take the Orange Line toward New Carrollton and get off at Metro Center. Transfer to the Red Line in the direction of Glenmont and take that three stops to Union Station.
The Washington Flyer bus will probably put your suitcase under the bus. You can carry suitcases on Metro--I_ve done it all the time, even riding the Metro to National Airport during evening rush hour--but it can be tricky if the trains get crowded. There are elevators in all the Metro stations as well, and hopefully none will be out of service.