Door opening in load-bearing wall

Hello,
a door is to be installed in a load-bearing interior wall (calcium silicate brick) in an older semi-detached house (built in 1976) (structural engineer approval obtained).
Questions:
1. Sawing or chiseling the door opening? Disadvantage of sawing: significant dust generation because water cannot be used due to parquet flooring on one side. Disadvantage of chiseling: vibrations? Unclean recess.
The work is to be carried out by a specialist company.
Which breakthrough method would the builder-experienced practitioner recommend?

2. The ceiling must be secured with steel supports. Is damage to the parquet floor to be expected even if the support stands on a thick wooden board? The parquet area in the demolition zone is generally protected with panels.

Would be grateful for helpful advice.

so I made a door opening in an old building apartment I renovated with the large 240 grinder. but it was a red wall and not load-bearing which I don't think makes a difference. I managed to do it relatively cleanly with 2 measures. 1. I hung the work area off the ceiling with foil, thickness 300µ, which is nice heavy and stable. 2. a helper stood next to me with a thick vacuum cleaner and vacuumed directly at the grinder. of course it dusted a bit but it was surprisingly manageable.

regarding the floor damage I would take a thick painter's fleece, a 25mm osb board and a 20mm beam and distribute the weight over a large area as you intended, that should work I think

Thanks for the hints. But a load-bearing 24-inch limestone wall with a grinder? I’m not sure.... I want to have it done professionally – with as little dirt as possible. Sawing seems to be the best method? But a lot of dust, because water can’t be used.

o_O hope you have thought about falling and bracing yourself....

Shoring - but of course, this was of course also coordinated exactly with the structural engineer. Are there any additional helpful practical tips regarding my questions/concerns? And again: The masonry work is to be contracted out - no DIY work planned.

Blow up ;-) The specialist company will know what it is doing and, if in doubt, will be liable.