How is Northern Ireland Governed?

Well they are two different countries. The ROI is goverened by their own laws and irish parliament. Northern Ireland has its own parliament (as such) but it is also goverened by the british laws.

There is obviously a huge difference in the way Northern Ireland and ROI are governed but I'm a bit confused. Is NI goverened by Parliament? And how differently is ROI governed to NI? :\

Did you not think to check an encyclopaedia or something rather than asking people?

There is little relation between the Northern Irish govt and the ROI govt.
Northern Ireland is part of the UK. Not ROI.
There is devolution. Like in Scotland (only NI don't have power over taxes. NI is an assembly. Scotland is a Parliament). So basically, we govern ourselves for local issues like education, health etc. But British Parliament still has control over some issues like Foreign Policy etc.
Every year, Parliament give Northern Ireland so much money in the budget and then the assembly decide how to spend it.
We have a coalition govt due to the divisions betwen Catholics and Protestants. The two main parties are DUP and Sinn Fein. First Minister is Peter Robinson and Deputy first Minister is Martin Mcguiness. Basically they are the main men. Otherwise, the departments are divided between Unionist MLA's and Nationalist MLA's, with the justice minister being given to Alliance who are technically neither Unionist or Nationalist.
Er ROI I don't know so much about. But it's almost completely seperate from Northern Ireland govt. (I know they still have a say sometimes)
Basically, they have a president who is literally only a figurehead. Currently, that's Mary McAleese. Kinda like the Queen in the UK, except she is elected. She only has a few constiutial powers
The Taioseach (currently Brian Cowen) is the Prime Minister and this is usually the leader of the party with the most seats. There are two houses, Seanad Éireann (Senate),the upper House, and Dáil Éireann (House of Representatives) -lower House.
It's currently a coalition between Fianna Fial and the Green Party.

Badly.

I knew that NI had an assembly, I just didn't know how dominant it was in aspects of day-to-day life in Ireland. Thanks.

Actually, I have. But I want to ask AS WELL.

Well, then I imagine you'd already have this information in a far more concise way than it will be given to you by random people on the internet.

I knew that NI had an assembly, I just didn't know how dominant it was in aspects of day-to-day life in Ireland. Thanks.

Not really. Can you not just leave me to it if you're not going to help me?

I can't believe you read it properly. As for not helping you, I think I am - but you're just not clever enough to see it.

Plus, I will admit a level of irritation: I'm sick of the number of people who, instead of showing a tiny bit of initiative, expect other people to solve their problems or 'help' them at every turn.

There is absolutely no need for you to be asking this question. Now, if you had a specific question, some information you couldn't find, or indeed something that genuinely puzzled you then by all means ask someone else. But why you would expect (or desire) someone to give you an overview of a broad subject when you can - with five second's effort - find it for yourself is utterly beyond me.