Ring the forest service in Johnstown Castle, Wexford. Lo call 1890 200 223. They should give you the full run down on what happens. As some of the earlier replies stated, a lot depends on the age of the forest and is it conifer or broadleaf. If broadleaf, it will be there probably for a century or so. If conifer it will be thinned at year 15/17 then thinned again at perhaps year 20/25 and clearfelled at year 35/45 all depending on the growth rates of the trees. Once clearfelled it is immediately replanted and it does mean a drastic change of scenery but you can request that attractive edge of woodland species are planted on the edge next your house when replanting takes place. Birch, rowan, larch are fast growing and some other broadleaves such as oak are very attractive and would enhance your property if the owners agreed to this. It would perhaps also increase the value of your property to be beside attractive woodland if the replanting is done attractively.
It is important to know who owns the forest. Its probably Coillte and they are not as bad as they are sometimes painted. Get talking to your local forester in charge and discuss your concerns with him. You might be surprised how helpful they can be. But do talk to them. You could of course try to buy the whole thing and then enjoy the tax free breaks from the sale of timber!! and buy a wood burning stove. Timber when burnt is carbon neutral and a whole lot cheaper than oil.