Adding a 3rd dog to the family...correct way to do it...?

[berner mom]

I currently have a 4 yr old Bernese Mtn dog and a 9 yr old Husky. I am seriously checking into getting a Golden Both my dogs are well socialized and have obedience titles.

I know that I have to 1st introduce them in a neutral area, 1 dog at a time before they are brought together into the home and ALL dogs must be supervised.
Suggestions on what worked for you when you brought the 3rd dog home? Is there a way to make this easy for all concerned? How did you cope with jealousy? What other kind of issues did you run across that I am not thinking about?

I have heard of breeders rubbing the scent of the Mom/siblings on a towel for the new owners to take home with the pup. Would the reverse work? If I had the breeder put the pups scent on a couple of towels and put it down in the house (maybe click & treat them when they interact with it...make it a positive thing), do you think this would work in helping the established dogs accept the pup?

Thanks