Gluing tubulars is not terribly difficult. You can do it if you put a little time into reading on the techniques used. I think it is more a question of the type of person you are. If you enjoy working on your bike and are patient then I say go for it. If you have kids and every second of your day is already accounted for then you are better off just paying someone and not dealing with it. In that way, it is much like mowing a yard. I know how to mow and I'm sure I could do as good or better than my lawn guy, but I'd rather spend that hour a week on something else.
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