Living alone: Full or Queen size mattress?

I plan to eventually live alone and so want a bed that I can move, set up, and change sheets by myself. Would prefer one that is bigger than my current Twin size.

I'm thinking of getting a Full size, but would an average adult woman (5'4") be able to manage that alone?

My family is telling me to get at least a Queen size: "its only a 6 inch difference! So you might as well get a Queen!"

But I think that when it comes to moving furniture, inches DO matter in the sense of 'is it more or less than the length of my arm?'

I'm also skeptical of any advice from my family, since they have a vested interest in seeing me get into a relationship and have kids (despite me telling them over and over that it will never happen).

So: Full size? Queen? Should I stick with Twin?