The trouble I have with making a call is when I think of what to say beforehand, then someone unexpected answers the phone or the person I want to speak to is not there. It messes me up and then I can't figure out what to say and "um" "er" happens.
I have to plan it out ahead of time.
Case in point... I didn't plan meeting my ex-boss well enough, when we met, he held out his right hand, I put my resume in it instead of shaking it.
When I met my psychologist, he said "Hi, I'm Bryce." I said, "Hi, I'm Bryce."