A tarp may be easier than a tent depending on how you pitch it,
If you use bungee cords around trees it would be easier than tying a ridge line,
But pitching it with trekking poles might be more problematic for you,
A small tent might be easier If you are not pitching under trees,
It's hard to say without knowing what your abilities are, I would imagine any would be difficult with only one hand,
Pop up tents are easy to pitch, but I think you would struggle folding it away,
I would suggest trying it in your garden, or a park to see which is the best for you,
You could consider a bivvy bag, that doesn't need pitching,
Good luck with it anyway and let us know how you go on,
A couple of pics is always nice