I read many problems with this. I am very unskilled in anything to do with Lan or internet inter communication, which could be why I don't have too many problems with it (LOL).
My procedure, right or wrong, is, first, make sure all the Lan computers are using the same Workgroup. I then find it easier to work with the Homegoups. I go to each computer and register them on the same homegroup, making my primary stationary the first set up.
I select the Advanced sharing settings and give sharing for the items, using each computer on my network. End result is I have access to most things on my Lan, which includes the Laptops which are brought in my frequently visiting family. This even incudes cross sharing of my home printers.
But, hang in, and I am sure you will get a more detailed explanation from a more knowledgeable user.