hi, absred16, and welcome to the forums!
don't be scared. i help a lot of students with nursing diagnosis as care planning is something that i have done for years. i will help you with it too if you run into difficulties with it.
there is lots of help available to nursing students on the student forums, particularly on the nursing student assistance forum and the general nursing student discussion forum. you can get to them by clicking on the "students" tab at the top of every page of allnurses that you are on. within the sticky threads (the first listings of threads that appear for a forum) is where you will find lots of helpful weblinks to help you in your nursing studies. in particular, and related to care planning and nursing diagnosis are:
nanda (north american nursing diagnosis association) has written the taxonomy (that's a fancy word for an arrangement or ordering of the nursing diagnoses into some kind of logical groupings). the taxonomy includes a list of all 188 nursing diagnoses, the definition of each, the symptoms of each (so you know you are diagnosing someone correctly) and the related factors (etiologies or underlying causes of these nursing diagnostic problems). it's really all written out for you already. all you need to do is learn how to work with it--and it's not that hard once you get the hang of it.
see you on the forums!