Hi Gillian,
To be honest, I do prefer to walk with someone, but my brother works weird shifts so is rarely able to go when I can. I do worry about getting lost which is why I try to just do hills that have clear paths (and summits) when I'm on my own, although I did recently have a scary visit to Ben Cruachan and the ridge
missed a cairn and panicked a bit, ok a lot. But, on the whole its not bad, except the sheep just don't appreciate the drivel the same way my brother does!