You can download the software and documentation with all the information from following link
https://dev.sitecore.net/Downloads/Sitecore_Publishing_Service/20/Sitecore_Publishing_Service_20_Initial_Release.aspx
After downloading, I installed the Pre-requisit of Windows Server Hosting (.NET Core) into the machine.
Then I followed the "Scripted Installation" option described in the documentation. It was much easier than the manual installation and provided lot of easy options.
Few points from my setting-up experience mention below.
1) Setting-up Connection Strings
For example, I ran the following command to setup 'Core' connection string$ Sitecore.Framework.Publishing.Host configuration setconnectionstring core '<your_connection_string>'
<Publishing_Service_Web_Root>/config/global/sc.connectionstring.json
Note that, it will automatically add "MultipleActiveResultSets=True;" to your connection string to support Multiple Active Result Sets (MARS).
2) Adding support to Multiple Active Results Sets on Sitecore Installation Connection Strings
To support Mutiple Active Result Sets (MARS) you have to add "MultipleActiveResultSets=True;" to end of your connection strings in your Sitecore installation.i.e. to <Sitecore_Website_Root>/App_Config/ConnectionStrings.config
<add name="core" connectionString="Integrated Security=true;Data Source=(local);Database=sitecore_core822;MultipleActiveResultSets=True;" />
<add name="master" connectionString="Integrated Security=true;Data Source=(local);Database=sitecore_master822;MultipleActiveResultSets=True;" />
<add name="web" connectionString="Integrated Security=true;Data Source=(local);Database=sitecore_web822;MultipleActiveResultSets=True;" />
3) Remember to do IIS Reset for Publishing Service Website Once you do any Configuration Updates
Not like Sitecore, you will have to do IIS Reset for Publishig Service Site to make your Configuration changes in Sitecore Publishing Service Website to take effect.
