If you want a good freewheel, White Industries is the way to go. In my experience, ACS and Shimano freewheels are not noticeably better than Dicta (ymmv), so just spend the $10 on one of those at first. As for actually installing the freewheel, if you're capable of opening a jar with a threaded or "screw-on" lid, you already possess the necessary skill set - you just have to figure out how to do it in reverse.

Godspeed, young noob.