I am in the middle of this and for sure it is do-able and lovely but once in a while you'll ask yourself how your old dogs did turn into such angels. You just got to do it.
In the past with introducing a new pup I wold get the most dominant dog out first and when that did go well, the others just followed suit. Never had a problem introducing a puppy at home. New adults I took to a neutral place with mine.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015