OK, issues up to the meter will be remedied by Irish Water (could simply be sediment build up due to works in the area), if they find no issue, then the problem lies somewhere between that and your taps, etc.. Have you had a meter installed recently or when did the problem arise?
A plumber (or anyone competent) can identify the water entry point to your house. In many cases this will be at a tap under your kitchen sink, stairs, or similar. Isolate the supply on the stopcock on the pavement, remove your isolating valve/ tap, attach a length of pipe/hose to point to a bucket/sink, and turn the supply back on. You'll probably need 2 pairs of hands here so you don't flood the place
If the flow is still poor, then the problem lies somewhere between the meter/ stopcock on the pavement and your isolation valve/ tap. This is actually common enough as poor building practices mean pipes were not buried deep enough by builders, or in some cases tree roots developing, or subsidence can result in the feed pipes being compressed. If that is the case, then the problem is yours to resolve, as you own that section of the infrastructure.
There was a lot of talk of a first fix free scheme, but I've yet to see any specific details of what that might be or when it might be rolled out, but I have read it will not cover any issues from 1m of the boundary into the house (and that's where most issues will be).
If the flow to your isolation valve is fine, then odds are the isolation valve itself has had its day or is partially blocked with sediment (again common enough with all the works going on). Either of those is an easy and cheap fix.
Expecting Irish Water to resolve issues within your property would be like expecting Electric Ireland to fix a damaged socket in your home.