Give yourself a whole day to do the LIM. Don't do it if you have to go to work or something later in the day. That way if things don't go according to plan or you break something, you have plenty of time resolve the issue. YouTube has tons of great 3.1L and 3.4L LIM gasket videos. The gasket set, if it's by Fel-Pro, is probably $70 tops. Find it on Amazon or something, it will be cheaper. If all gaskets are original, you'll need upper intake gaskets too. That set costs maybe $40 or $50. That set should include other o-rings for certain tubes and hoses. I would save up maybe $150 for this job (may seem like a lot, but just think of what it'd be at a repair shop), especially if every gasket needs to be changed. I'm not 100% on these amounts, this is just what I would expect. You also need to buy coolant and possibly change your oil? I know on the 3.8L if you spilled coolant into the valley, you had to flush it out with oil and do an oil change. I'm not sure it's the same for this engine?
