To me, they’re very easy. They’re actually what I learned crochet off of. When I was pregnant with DD, I was in college. 3 days a week, I had like 4 hours between my 2nd and 3rd classes of the day, so I would go to the student center and work on the booties.
I’ve done almost all the patterns so far and the one bit of advice I can offer is…count count count. Some of the rounds don’t end where you think they’re going to and if you try to deviate from the pattern you’ll end up with a bootie that’s slightly off center. This is one case where I totally agree with trusting the pattern and not adding your own things…unless it’s different colours, or in the case of the skates, changing the wheel orientation.