We had an in-house integrator who deployed the solution.

I performed the deployment myself.

Depending on the complexity, most likely we will be using some vendor assistance, or consultants, to help us in maneuvering the application. Like integrating between Oracle and Banner. These are two systems that both use the same database but have different applications. The companies do have some standards when we integrate these applications but I need to refer back to the technology owner for understanding the parameters of integration.

I deployed it myself in one of our projects and it took about an hour.