I wouldn't call it very easy, it's certainly routine in the lab but still can be a lot of effort. This also has to include purification, not just synthesis. And without a real lab it can get much more difficult. And many proteins are not simple, they can be rather sensitive which makes it difficult to keep them intact while producing and purifying them.

You would probably use E.Coli anyway unless you have to use yeast because of some posttranslational modifications.