A lot of the teachers in the tutorials mention that you can pin but they are so advanced in their work that they don't need to. When I run across a tutorial that goes too fast for me, I pause it and work out the step, then watch it again until I 'get' it.
As for "pressing" - a lot of that depends on your iron. One of the famous teachers (and for the life of me, I can't recall who it was) suggests that when you first start with a new configuration to MEASURE AT EACH STEP. That way you can tell if your pieces are cut correctly, if your seam allowance is spot-on, and if you press correctly. Watching someone do the steps, and translating these instructions to your own work takes effort.
I do agree that some of the craftsy classes are wonderful. However, even there, some teachers are more "relaxed" in their accuracy than others.