They can be a lot of work.  Unless you have to right tools (especially the "stuffer" machine - one that extrudes the sausage filling out a tube that you slip the casings over...) I imagine it would be a nightmare.  If you aren't willing to dish out the cash for the equipment, you can still make sausage.  Just make sausage patties instead of sausage links.  It's not quite the same, but a lot simpler.  Grind the meat and add seasonings, etc.  Then just shape into small patties.  I know it's not exactly the same, but its a much easier task, and pretty darn tasty too.