I think ahead to determine if the next block (or row) will be affected. Then I ask if I can live with it. Over time, I have come to realize that some little flaws will not show up in the finished project but it took a lot of trial and error on my part to "get" that.
I used to take anything apart that was more than 3/16" off. Well, glad to report that those days are over. I have gotten quite good at fudging, tweaking, adjusting and making pretty things.
Your block is a pretty thing. Don't be too hard on yourself, go slow and do your best.