As a Communications professional for over 25 years (I no longer just reference myself as PR) I believe the hardest thing was to learn to wear many hats because working in communications s is not about one area you must be able to juggle multiple skills, i.e., writing, strategy, public speaking, consulting, relationship building, change management, graphic design, event planning, etc.
As a communications professional I've had to thoroughly embrace that my role is to build mutually beneficial relationships between organizations and their publics. Whether you’re employed by an agency working on multiple accounts or representing an individual or a company, what you’re doing is building the reputation, trust, and credibility of the client you manage. You must be able to build strong connections with multiple stakeholders — including journalists and the media, government agencies, and other prominent industry bodies — and leverage them to shine the spotlight on your client (for all the right reasons). You can do this through media (paid and earned), networking, collaborations, award nominations, and off-platform events.
The responsibilities of a PR Manager varies (as I've outlined) and they require multiple skill sets, but I love the work I do, and provide me with a sense of accomplishment. Good luck!
You also need to have a good sense of awareness and story-telling when managing proactive PR to ensure you are garnering the most media coverage and telling a positive story.