It was a bit odd on the first afternoon and evening. The next morning I put on my new specs and didn't really think about it too much. No problem descending the stairs (I realised later that I already move my head -rather than my eyes- down to see where I am going, so no issues there). I'm still needing to make minor adjustments ot my head position when I am reading, but it's barely noticeable.
I'm off to the opticians today to choose my "free" second pair. And to get my prescription so I can get my old pair re-lensed, I'm keen to use Cillary Blue again after DH's great experience with them earlier this year.