First Aid Quest
You may learn the first aid skill without becoming a scientist.
In order to get familiar with the first aid skill, you must complete a quest. The quest takes place inside the newbie simulators, and it involves getting taught how to perform first aid surgery by someone. The quest giver will ask you for help, and will direct you to your first task.
Remember -- if you plan on joining the scientist guild, then this quest will be useless to you, since first aid is a level 1 scientist skill.