I think a 10G nano is extremely easy to do.
I never kept a fish or coral in my life until earlier this year. I started up a nano and I was fearing all these problems, but I never had any problem as I knew knew what expect and what to do from all the reading I've done.
I think the only reason why people think its hard is because most people don't spend the time to READ about it and don't know what there doing really
Since one of the fish I have is a Scooter Dragonet, I spend about 20-30 minutes a day just to feed him 3 times a day. If he wasn't in there, I would probably spend maybe 5 minutes a day to feed the other fish.
I also dose B-ionic, that only takes about 1 minute a day.
Takes about another minute to top off the aquarium every day.
Once a week I spend about 20-30 mins to do a water change and clean the glass off.
I test my calcium and maybe my PH and nitrates once every few weeks to see where its at, so thats another 5-10 minutes.
When I was cycling my nano, I tested every day for the ammonia and such, but after it finished I started testing less and less since it wasn't needed.