Hi David,
You are not alone in your experiences. I think it took about 12 weeks for my blood sugars to settle down, but I still go through erratic periods for unidentified reasons. I've read posts from forum members claiming to still be in the honeymoon period a year on from diagnosis.
Just over a week ago I made a switch from mixed insulin to a basal/bolus regime and was initially surprised by how smooth the transition was. Then yesterday afternoon, my glucose levels started to climb (up to 15 at one point) and I didn't react to (3) correction doses given through the afternoon and evening. In desperation I even threw away what was left of my insulin pen and started a new one as I wasn't sure when I'd first taken it out of the fridge.
I was above 12mmol when I went to bed and still above 10mmol when I woke up this morning. As I write this, it's now lunchtime, I bolused more than I have been doing for my standard 40gram lunch and my levels seem to be falling (thankfully).
I have no idea why I went high, it just seems to be part of the fun and games (for me anyways)! Hoping I can stay at normal levels for a while now.
I don't think you'll ever completely stop learning but like most things in life, it gets easier with practice.
Take it easy.