RE: limit the size of stories
The team I’m currently SMing I told them “No more 8s!” which a sprint or two later became “No more 5s!” which is now becoming “No more 3s!”. I realize this isn’t realistic for everyone but it’s really helped the team mature; their velocity is steadily improving, they predictably deliver on what they commit to, and we’re pulling work in by the handful.
We do however estimate tasks; the team told me that they prefer to do this because it forces them to think even more granular. During grooming I’m seeing more and more instances of “what about task x, y, and z?” and then “this is too big, let’s split it up”…coaching themselves. It’s a beautiful thing!