What do you mean by "partial completion date?"
A word of advice - don't think in terms of teaching yourself Project. Think
in terms of learning "Project Management Using MS Project." IMO learning
the mechanics of using the software is only a start (and IMHO, a minor part
at that) at learning to actually use it effectively. It does very little
hand-holding and a foundation in the principles of the formal discipline of
Project Management is absolutely essential to using it properly. The best
approach is to take a 2 to 5 day formal training course that would teach
both Project Management theory as well as how MS Project applies that theory
if at all possible. If that just isn't in the cards, at least hit the
bookstore or Amazon and get some good self-study materials. One book I can
recommend is "Microsoft Project Step-by-Step" from Microsoft Press because
it actually deals with using Project to develop and manage projects rather
than just talking about menus and data entry. Another "must have" is the
"Guide to the PMBOK" available from the Project Management Institute,
www.pmi.org. It doesn't even mention MS Project per se but it is the ANSI
standard definition of the art of PM and is an essential reference for
understanding why Project sometimes behaves the way it does.