- Use a .ie/.de domain and host your sites in those countries.
- Use WHOIS information with an Irish/German adress.
- Enter company details in Google Local Business Directory.
- In case you are using another TLD (like .com/.net etc), use the Geographic Target Tool in Google Webmaster Tools.
- Get inbound links from Irish and German Sites.
More information about Geotargeting.
Hope that helps.