I don't like the term "missionary work" when it comes to normal members of the Church. In fact, I really dislike it, based on how it usually is discussed. It implies that all we need to do is "work" harder (with all the negatives that includes). I think it has led to efforts by many members to "figure out who is ready to hear the Gospel" - when we should be opening our mouths with all and believing they will be filled with whatever each individual needs to hear. We too often act as if we are hunters, trying to pinpoint that specific deer that we can bring down with a well-placed shot. I prefer to go back to Jesus' original invitation and act as a fisherman who casts his net and sees what fish swim within its reach.
I like "share the Gospel" better, but I like "share the Gospel by sharing your life" best. The Church and the Gospel are an integral part of who I am, so why shouldn't I talk about it in the normal flow of many conversations? Protestants of every stripe do it that, as do Buddhists and Muslims and all kinds of people. Not everything has to be a "missionary opportunity" - but almost everything deals with my faith and my religion. If I talk naturally about it without concerns about "converting" anyone, those who are touched will ask - and those who aren't won't. I truly believe, based on personal experience, that if I am open to be used, the Lord will put people in my path who want to learn more - but I have to be talking about my life and my faith for them to be touched.