Remote in to Firewall

Hey everyone,

Pretty broad question, and I'm not sure why I couldn't find any direct answers online. Let me give an example.

If we have a brand new site, with only an ISP feed coming in, and I want to install/hook up a firewall and remote in to it to configure, is the easiest way to simply configure the WAN/Mgmt interface as DHCP or Static, plug it in directly from the ISP handoff, and remote in to the device via the public IP? For eg, a PA Fw, have the tech log in, configure the mgmt interface for dhcp, allow ssh/https (should be enabled by default), and then connect to it remotely? Is there an easier way to gain access to a remote box for provisioning, in a situation where the tech is not familiar or comportable with configuring the fw (tech is just there to plug in cables/hardware)

Thanks