Hopefully you've had family members that have saved pictures and individuals that you could lean on as family historians. This can go a long way towards filling in the last 100 years or so of your family heritage. Another way, and by far the most rapid way to answer genealogy questions is to subscribe to a site that has search capabilities, (Ancestry, Family Search, MyHeritage, etc) to ask questions. This will cost some money, but is well worth it in the long run for saving time. Other possibilities are using the G2G feature of WikiTree and asking specific questions. Most of our genealogists are happy to point you in the right direction. Yet other possibilities include the local library reference collections, your local LDS library, and FultonHistory.com, (it's free to use, but the learning curve for searching is a bit steep- read the instruction pages before you waste a lot of time.
The National Library of Ireland has hundreds of years of Catholic Church records which are not indexed in that venue, but if you can get by the Latin and the cursive, I've found a great deal of aha moments there.