I am just starting out too, but I would like to pass on advice my instructor gave everyone the first day of our clinicals...."You are learning, you are students, we do not expect you to know everything or be experts"....yadda, yadda. She went on to say that even as professional nurses (not student nurses) we are still always going to be learning. This made me feel really comfortable, well I guess I should say more comortable.
I would have to say for the cancer patient....how is their nutrition? Some Chemo's cause a bad taste in mouth and can lead to anorexia, so there could be fluid or nutritional imbalances to look for. Also Impaired Skin Integrity for the patient recieving Rads.... And definitly do a thorough Psych/Soc Assessment....look for support from family, fears of dying, Spiritual Distress, etc.,etc.
I am in my first year as well, but have many people in my life with cancer, and am interested in this field. Hope this helps....and let me know how you did