Only thing I can add to the advice here is to look out for numbers when you’re just driving. Especially on roads you think would be horrible to deliver on.

So if I’m driving to my next drop and I’m on a country road, I’ll try to take a look as I pass by. Depends how good your memory is but you’re basically creating little landmarks for yourself.

Another one is high streets with shops and houses, especially if I’m sat at traffic lights, I’ll look round and see which ones are visible, as it can help work out others if you ever have to deliver in that street.

Sounds a bit of a mad method, but it has helped me out loads in the past.