I'm going to leave my group early during a presentation project to do a solo project
Why are you leaving your group?
They just don't understand my work.
You have responsibility to see the project through to completion as part of a group. You can't leave the group early just because you want to do another thing on your own.
I don't trust them to get things done on time, so I want to do it myself instead.
Rather than doing it all yourself, which places an undue burden on you, you should try and walk them through how you do the project.  That way you don't have to do everything themselves, and you develop your group into a better asset for you company.  Maybe you even get a promotion out of it?