I agree with what you said, I just want to make sure I'm ready for this role and not going in over my head.
Would you be offered the position if you were not ready?
This change may not be right for you - I have no idea. But you have to realize that almost everyone who ever takes a big leap up in responsibility/duties worries about how they will do.
My advice is, if you want the job, figure out what you must do to be successful in it and do that. If it means learning new presentation or schmoozing skills - learn them. Toastmasters is a good suggestion but so is hanging out with those in your company already doing that job. Is there any chance of getting a mentor even if it is informal?