You don't study scaring, you just do it.
I'm not even breaking a sweat.
I understand that you place the building and take the workers immediately.
as the rulebook lists turn order like this:
Step 1: You may place one Worker on the Main
Step 2: You may place Workers on any number
of Buildings on your Player Board. You may repeat
this step as many times as you wish, until you run
out of Workers or Buildings to place them on.
I infer that you could then use those buildings or workers.