[font=verdana, arial, helvetica, sans-serif]i was recently accepted for fall 2012 as a transfer student from california, so hopefully this helps!
the nln wasn't horribly difficult, but if you don't get all-around good scores, do try to excel in at least one category. personally i tanked in the math section (46) but i did well in the others - 92 for verbal, 95 for science. i kind of skimmed over the study guide about a month prior to the exam, but i really only started studying intensively like two weeks before. i'd say a month is good, two would probably be better. i took the exam about a month before the application deadline, but i actually went to go visit the campus to take the exam, so the results were instant. if you're going to find a proctor for the exam, i'd naturally allow a bit more time.
gpa-wise, i don't know what the statistics of the other accepted students were. but my prereq gpa was 3.8 and my cum. gpa was 3.4 i think.
i'm sure your fg will be fine. the sond is pretty lenient, i've found. after the admissions office did my transfer credit evaluation, i was worried that none of my math classes would meet the fs requirement (my precalc class was still under eval at the time) and when i emailed sond they said that even if the requirement wasn't met, they'd allow me to take it concurrently with the first semester nursing curriculum. so yeah, don't sweat it.