I'm an O&M specialist, and it souinds like you have the basics. However, I would suggest giving one a call and book an appointment anyways. I've found that over time, bad habits can creep in and get reinforced, until they are ingrained. I just recently had a client who has been using his cane for 20 years.... hold it in front, without scanning. That's what he thought the technique was, and how he has been using it. Because he had some usable vision, he was able to see obstacles and move out of the way, but as his vision got worse, he was unable to see the obstacles anymore and started to clip his shoulders.

I often find that many clients don't scan far enough (1 inch past your shoulders), or scan too hard on one side (the proper technique is to hold the cane on your mid-line, roughly in front of where your belt buckle would be. But because this takes noticable effort, peoples' arms slowly drift down and to the side... but if they are still scanning the same distance, they aren't scanning the further side enough and too much of the same side).

Also, have you learned about APSs (Accessible Pedestrian Signals)? I've had a client who throught they were all broken for years, until I explained how they worked and how to activate.

I was lucky I had a great teacher here in Scotland and she didn't let me slack on my cane training. I am not a great lover of it though and I still have a weak ankle from going over on it. Just as it was getting better I would go over on it again. For me it was just practice using the proper technique and that built up my confidence. I am lucky I live in a small town in the Scottish Borders and I know most of the routes I have to go. I found once everyone got use to seeing with my cane they just let me get on with it and very rarely ask me if I want help now, if ever. I have picked up a few bad habits though but most days are good. It's nice going into the city it's like a little test for myself and my cane skills. My instructor told me don't worry what other people are thinking. They are either to busy trying to get out the way or thinking about themselves. Have fun and enjoy it more benefits than pitfalls.

How are you with snow and ice? Or is that not a problem where you live? Similarly, travelling on grass or other not-smoothe surface. Those are the times you're going to need to use two-point touch. Your cane won't slide over grass well, and will get stuck in the snow, if you're using constant contact in those situations. Also, finding snow covered curbs and sidewalks can be quite a challenge. How do you feel about traveling in crowds, where you might not be able to safely extend your cane the full length without tripping people, or make a full arc in front of you because of lack of space? I've been blind all my life, and I still find this an enormous challenge.

Those are the only techniques I can think of that you didn't mention in your post. Otherwise, it sounds like just a matter of constant practice. Do you have a friend you can travel with, who is willing to slow down a little and let you use your cane, rather than guiding you all the time "because it's so much faster"? If so, practicing by traveling with a friend can be really helpful. If you're about to screw up really badly, they'll prevent you. The challenge is stopping them from offering too much help. I found practicing on my own was never helpful; I was always too chicken to step out of my comfort zone because I might make a mistake. So I never learned or refined anything. When with a friend, I was (and still am) willing to try a lot more things, and eventually start doing those things by myself.