Ah, you must have had a badly written pattern - I promise it’s no more difficult than making pieces and sewing them together.
The thing is, you start with the neck, which needs to be shaped, so that bit requires a bit of concentration. Once you’ve done a few and know what you’re doing and why though, it gets much easier. After the neck, you’re off! It’s just round and round after that, and no sewing up.
This one is easy, very adaptable, and best of all, free
. I don’t like cropped sweaters so made it longer, and you could easily add in a stitch pattern if you wanted, or stripes, or a cable or two if you enjoy those. I made one for my daughter - just plain and very oversized - and she loved it for working at home in the winter.
www.ravelry.com/patterns/library/warm-up-sweater