I'd call a general contractor. There may be several trades involved to do this job, even if it is not a load bearing wall, which would be more involved.

Framing

Drywall

Painting

Electrical

Tiling (?)

Possibly HVAC and/or Plumbing

JM$.02W

Yep Many things come into play when moving doorways so agood contractor is a must . Often there is electrical, plumbing etc in those walls that adds to the issues . Why are you wanting to do this would be my first question.

The biggest expense may actually be moving the light switches out of the way, because usually there is not enough play in the wiring to move things much. I widened three door openings and moved one of those a bit (they were 24" originally) and moving one of the room switches in particular was very difficult.

Houses are not Legos to move things around on a whim. IT has to be done very deliberately and thoughtfully. "Just" a little bit can often cost thousands to tens of thousands. It depends on all the systems that are inside those walls, and the ability to be able to widen something to a stock sized door instead of custom. And a dozen other invisible things that cost money.

And we wait for info.