There is a lightwave lscript that will actually delete one half of a obj file, and mirror the other half, and even weld the overlapping points. That's a one step solution. There is also another lscript that just deletes 1 half of the obj... you then just use the lightwave mirror command and weld the points. (You really want to weld points now, because otherwise you cannot use displacement mapping.) Something to keep in mind though.. if someone wants to ay apply a tatoo on a right shoulder, if you have mirrored uvs, it'll come out on both shoulders. Unless you assign mat settings to left and right as well.

Way too many people take way too many things way too seriously.