How will the deportations work?

So assuming they ID an illegal immigrant walking down a street, are the police officers just gonna tap them on the shoulder, shove them into a car, and take them back to venezuela/Mexico? Will they deport people in the middle of schools/streets/apartments? That would cause serious unrest. Or do they ask the immigrants to cooperate?

And how will they ID an illegal immigrant? Are we sure some legitimate citizens won't get caught up in it?

EDIT: And for those saying, "This isn't new, it's happened before", it's not as similar as you might think.

Obama deported 4 million immigrants over a time period of 8 years. Trump wants to deport 11 million immigrants in a few months.