Hello dear,

Case presentations in the postings will be sometimes stressfull but we all are there for learning and we all are humans and mistakes are done by humans,
If you remember that fact that " Mistakes are done by humans " then you won't get that stress of doing mistakes while giving presentation,
Second thing is be well prepared with your case in all aspects ,
Be it disease, pathophysiology, diagnosis and treatment and managements,
When you are perfect with subject and case then you need not to worry about anything or anyone,

Just relax and give your best in your case presentation dear ,

All the best !
Prepare well !