Stressful all the time

[STEVENSAKURA]

- Peter is a surgeon so his working environment is extremely stressful all the time. Whenever he has an operation he has to have the highest attention because if he does not succeed in his operating, the patient's family might sue him to the court.

- Are these sentences natural enough? :)

Thanks a million!

StevenSakura

[russcable]

Peter is a surgeon so his work environment is extremely stressful. Whenever he performs an operation, he must be perfect or else the patient or their family might sue him.

"all the time" could be used to add emphasis but is not necessary in this sentence. "is" is sufficient.
The patient has an operation, the doctor performs it.
"have the highest attention" doesn't work at all. Another option is "must be very careful".
"if he does not succeed" is okay, but we already know what he's doing so there's no need to repeat it. You can also use simpler options (as I did with "or else") so that you don't have to explain this in such detail.
Just the patient's family makes it seem like the patient died. The patient may survive and still have a reason to sue.
You sue people IN court, not "to court" and we're not talking about a specific court so you don't need "the" (although you could say "in the courts", but that's another long explanation).
You don't sue people any other place, so you don't really need to say "in court", but it's fine if you do.

[Erik_Kowal]

Or:

"... he {must / has to} pay the greatest possible attention..."

Otherwise, it seems to me that Russ has done a good job of covering all the other relevant points.