I started OU January 2015 and graduated December 2015. I doubled (and tripled some classes) almost every session and did just fine! My best advice is to follow the rubric to a "T".
I found NRSE 4520, 4530, 4550, 4560, 4570 to be very easy.
NRSE 4510 was tedious because of being the first class and getting back into the swing of things. NRSE 4600 (final class) was somewhat time consuming but overall pretty easy.
NRSE 4540 was time consuming looking up statistics regarding one's state/county.
NRSE 4580 was horrible. Dry boring material that made it hard for me to stay focus.
Overall, I really enjoyed this program and did not have any problems at all.
Arts class that was extremely easy was Music 1200
Cross cultural class that was super easy was Pete 2000
Literature class that was fairly easy with reading the book/ no APA requirements for postings was Phil 1300.
Take Business Communications with Penrod... easy class, and actually useful!
I hope this post helps others. Good luck in your upcoming semester!