Us Oldies must stick together I am 66
Stepwise ...
Decide which PC is going to be "Master"
Backup your library (VITAL !!! Just In Case)
Go >Tools > Options > Media Server >
Click the Checkbox "Use Media Network ....."
You will be led through a set of screens
One will contain an Access Key xyz123 that will be your connection code , make a note of it
Go to your "Slave Computer"
Goto File > Library> Library Manager > Add a Library
Select the top One Library Server
The Dialog will ask for the Access Key, the one above,
Enter the code and there you are. You will now be able to see, play and manage your Library from the Slave PC
Any changes you make on either end will sync ,
Go >Tools > Options > Media Server > Client Options > Sync With server checkbox
Both PCs obviously need to be connected to the network either hard wire or wirelessly
You will find if you use just 44.1 audio wireless will be OK anything bigger you will probably need hard wire (maybe) Gigabit connection
There are lots of configurations you can make to make life easier.
You may also wish to look at JRemote either for Apple iOs or Android which allows you to control your "master" from a handheld. I use a IPad Mini for example
Hope this helps
Mike