Upgrade to 4.3 (from 4.2 sp09) -- side by side

We are currently at 4.2 sp0 and need to upgrade 4.3. Our servers and databases are Windows Server 2012 R2 and SQL server 2012 so I'm looking into a side-by-side upgrade. Is there a detailed reference/order of operations available for a side-by-side upgrade?

Thanks