Be sure to install it on its own server since it installs a lite version of VBR and VONE along with Orchestrator.  Check this site for Architecture information - Architecture Overview - Veeam Disaster Recovery Orchestrator User Guide

A few tips to make it easier: 

• have the scenario (apps) you want to protect available and their dependencies ready (for example AD/DNS accessible in the recovery site)
• if using, prepare vCenter tags and categories and assign them to vSphere infra objects before starting Orchestrator config
• have your users/groups prepared in AD (for assigning them Orchestrator roles later) 
• depending on what you want to showcase - create your Data Lab, custom scripts
• Orchestrator initial configuration needs the user under which Orchestrator was deployed. During this step you can add other users/groups