Hi,
Probably a stupid question, but since the price of BTC will obviously go down rapidly if a hard fork happes.
Will we get some kind of an annoucement/warning hours/days before they start the fork or will this happen from one second to the next?
There is not going to be an alarm, but if you keep up with the news and developments on bitcoin and take the time to inform yourself directly and to not believe second hand information, then you will likely find out before it happens.