I am so glad you asked this question. I am going to start a technology post since I have not yet implemented this. But this topic intersects with this discussion and your conversation about flexibility and technology supports.
I agree with you about not seeking perfection. Often the last 5% takes 95% of my time. In addition, I think that when you share with the students why you are moving to HyFlex — what’s in it for them, they are very patient, forgiving, and helpful while you make adjustments.