How do I cut and cap copper water tubing cheaply and safely?
I think you should definitily go with sweating. It is very easy(even though open flames from a torch might seem intimidating) and is more reliable than compression fittings. Plus, installing a cap is one of the easiest things to do, so it will be a good practice to learn a new skill.

You can also achieve a pretty clean cut with a hacksaw, if you dont want to invest in a pipe cutter.