However, I would say, start easy. If you think it’s a big deal, you can add more components as you go along.
Agree, go with GIK due to their good service and pricing. You can start with bass traps in corners behind speakers and panels at 1st reflection points. You will need either diffusion or absorbtion on the wall behind speakers to improve imaging. Hard to say without knowing your room.
Please tell us the size and layout of your room, type of floor and walls.