I used to be frightened of putting air in my tyres, but for the last 7 months I've done it once a month. Still rather dread it, but every time doing it makes it easier.
Walking over glass floors - that's another matter. I promised myself I'd do it when I took my gd to the Spinnaker Tower in Portsmouth - but could I? I recently climbed 279 steps to the top of a church tower for the view, but when I got there I clung to the doorpost, unable to move.
I lived in Cambridge for 20 years so I had to learn to parallel park. My son taught me a very useful system, which I find hard to describe. I'll have to write it down next time I do it.
Spiders . . . again, I have to cope, and I can't hurt them, but they do horrify me.