If the electrician knows what he is doing, he will know exactly where to cut the hole for the receptacle box. My house was built in 1921 and I had 2 separTe circuits installed in my living room and another installed upstairs on the second floor of my house. Only 3 holes were cut out for the receptacle box.
Now, if you have a friend do it who says “I have done this before”, run the other way and hire a licensed electrician.
Now, if you have a friend do it who says “I have done this before”, run the other way and hire a licensed electrician.