One of my hobbies is sewing - I make my own clothes!  For many years all sewing was done by hand, but I use a sewing machine!
Is sewing hard to do? 
It depends on what you are trying to make, but basically it is just the fastening or attaching objects using stitches made with a needle and thread.
So sewing also entails putting pieces of fabric together to make a article of clothing too. 
Yes, that is what sewing is!  And it is one of the oldest of the textile arts
What kind of clothes do you sew? 
I make skirts and dresses using a sewing machine, which was invented in the 19th century
That sounds like a worthwhile hobby in my opinion.