How you dress is easily controlled. Be sure your clothing allows you to breathe easily and your shoes are comfortable for standing for a while. Your facial expression is important. Make eye contact with the audience. Strive to look interested and pleasant.
Most speakers get moist palms and a dry mouth.
It's part of being nervous. You may want to keep a glass of water to sip nearby as well as a handkerchief for wiping your hands or catching a surprise sneeze. Some women like to apply a light coating of petroleum jelly or lip gloss to their lips and front teeth so that they don't stick together. When not using your hands to gesture, keep them at your sides or holding your note cards. Experts discourage speakers from putting hands into pockets or holding onto the lectern for dear life.