Always a fear for parents who are considering sending their children to Gaelscoileanna.
You usually get great support from the school and children pick up the language quite quickly when immersed in the language. Gaelscoileanna often run night classes for parents so an opportunity there to learn and socialise.
If you end up having difficulty with any particular subject you can always get the equivalent version of the book in English.
As your child will be starting in infants the immersion for you into the language will be at a nice, steady pace.
Having taught in a Gaelscoil I can honestly say that you'll be doing your child a favour in instilling in him/her a natural love of the language rather than an anglicised approach to it.
Gaeilge being used as the language of communication makes it easier for the child.
If you're worried about how you'll manage .... don't .... you will ... it will be worth it for your child.
Children in Gaelscoileanna love showing others their mastery of the language .... especially on tours, trips etc.
But .... just so you choose wisely ... look at all the schools in your area ... both English and Irish ..... because all schools have something to offer.
If you find a school that interests you then look to see if there was a W.S.E. (Whole School Evaluation) done ..... have a read, read between the lines .... and you'll learn more from that report than you'll ever pick up by just visiting the school!
Link to W.S.E. reports here:
http://www.education.ie/insreports/school_inspection_report_listing.htm