I think some of my internal and external reactions to certain elements in PMR might be creating blocks. Like, when I mess up in PMR, it's probably having having a negative effect on my consciousness, or holding it back from expanding further until I completely understand what happened, and I think this has to do with what Sainbury was saying. The benefit of going out and creating positive experiences with other beings is extremely helpful, especially if you are able to become aware of your intent and guide your actions. After I showed up here, some very important ideas seem to be starting to make a lot more sense. I'm already feeling positive results of my participation here and it wasn't something I was expecting.
I also do believe Sainbury hit a spot there with you, though when you write "when I mess up it's probably having a negative effect on my consciousness". Be mindful of this way of thinking, if this negativity is just you feeling you should be better, and then "punishing" yourself because of it by limiting yourself. In other words, you are creating a belief system every time you mess up, but you really don't need to. Go out, mess up, but don't limit yourself because of it. That's sort of what Sainbury is saying between the lines. You interact, you mess up or you do well, and from this we learn.
If this is not for you, I know it sometimes is for others. So I just wanted to add it to the thread.