A fantastic resource for figuring out the pronunciation (and meaning) of an Irish placename is: logainm.ie.
Click here for a list of townlands in the parish of Tibohine. [Tih-bo-HEEN]
Where you see a PLAY button, you can hear a recording of the pronunciation in its Anglicized and original Irish (Gaelic) forms.
Be sure to click on the blue buttons falling under "Archival Records" to discover, not only a translation of the meaning of the name, but a list of alternative spellings (and any alternative names) for your selected townland.
These spelling alternatives (that SoundEx won't help you with) will proved invaluable in your searches through 19th century records.