In reply to 19G:
Things that helped me,
Be safe and slick not simply fast.
Use a system that works for you, keep improving it, it will become second nature.
Concentrate and focus when setting up belays, work to a plan, I use DATES, Direction of load, Anchor selection, Thread anchors, Equalise anchors, Secure system.
Do it once and do it right, check it, then move on and don't keep rechecking.
Practice systems and rigs, use table legs in the kitchen etc if access to crags is limited.
Don't carry a full rack on each climb, only take what you might reasonably expect to use.