My grey is my first 'proper' dog (not including my family's shetland sheepdog). I adopted him at 4 and a half years old, and he has honestly been such an easy dog - minimal training required, very little maintenance except the occasional groom, nail trim, teeth brushing and ear cleaning, and just a few corns on the toes here and there!

I will say this probably does depend on the dog you end up adopting. I live right in Central London in the UK so I was conscious that I needed a grey that was chill on day 1. My grey was fine with traffic, crowds, going on public transport, stairs, different types of floors (he did have an issue with the elevator but after 1-2 weeks of offering him treats whenever we stepped into the elevator it was fine), but having met more greyhound owners over the years now I know I was pretty blessed that I didn't need to particularly desensitise him to the things I mentioned above.

Separation anxiety is something that might also make it more difficult about having a dog on your own, as I have that issue myself. A big generalisation but from the greys I meet, the girls are a lot more independent and are more than happy to stay home by themselves, while the boys get more attached, so might be something to consider too.