Janet, don't fret about the stairs - they will come with time. One day you'll realise you've walked up a couple of steps normally without thinking about it. Sounds like an extra grab bar might be a good idea, though.
Like you I live somewhere where it's hard to find a flat walk. I found walking up hills really hard work after the first hip, and felt a bit despairing at first, as hill walking is my 'thing'. However, my physio suggested I use walking poles and that really helped for a few weeks. I don't normally use them or like them, but I got myself a cheap pair, and they not only helped me get up hills but also kept me symmetrical. You definitely need some sort of assistance up hills at first.