HI Kelly,
Like everything else, you have to budget your time. Personally I have been prompted by Ancestry.com and other genealogy sites to add GGrandparents and others simply based on undocumented family trees that have been published. With names as common as Murray, (for example), one can find tens of different individuals born in Ireland in the same year, so one needs to get some specific evidence to state which if any is the REAL ancestor. Most of my breakthroughs come from finding obituaries in old newspapers, (I use a (free) upstate NY site called Fultonhistory.com, but I'm sure there are others for other parts of the world). In the meantime, I work on the ever expanding margins of the family tree, (not just my bloodlines). If you keep your eyes open and watch the internet , (like the National Library of Ireland's RC Church records which you can browse if you can get by the cursive and the Latin) you never know where or when you will get that breakthrough.
Keep at it and enjoy the hobby, (And get involved with some of the projects on WikiTree if you can contribute)
Bob