How awesome that a few other nurses noticed your struggles, advocated for you, and you got a new preceptor! The first thing you need to do is thank your manager, tell her how much you want to do well, and tell her exactly what you feel confident about and what you are struggling with. Maybe you could come in on volunteer time to shadow or get some time on just the tasks that are most challenging to you. Then make sure you talk to your current preceptor and thank her for her introduction to the real world of nursing and let her know how much you admire and respect her. Don't bury your face in your hands and avoid things that make you uncomfortable (be it people or tasks) - reach out and conquer those things with positive attitude, enthusiasm, accountability, humbleness and gratitude. Welcome to nursing :)