When I still had my IT business at some point I took on doctor's offices as clients. It was a great step up for me but they all wanted contracts with a 24h support build in.
I never felt so miserable even though the money was good. The constant worry of a potential phone call would be enough for me to not go and do things.
What helped was getting a good backup partner. Someone reliable. The feeling of responsibility was always there but it made the worry go away.
Good luck with the release today!
I remember getting text messages would cause me stress. Our infrastructure had so many issues that it would often be a server notification so I’d have to drop everything and rush to a computer. Not fun at all, but having my business partner there to help me was huge. I agree completely with the “don’t go it alone” approach.