I haven't changed my IC yet, but I did do the uppipe, downpipe and catback on my own. I didn't need any sealant for any of the gaskets. I used the Grimmspeed gaskets and everything seems to have sealed well. I would get some PB blaster or something similar and soak all the bolts (including the ones on the heatshields) the night before you are going to start working on it.
I also got tuned at Kspeed after the parts went on, I feel like Matt did a good job and knows what he is doing. He had to change the restrictor pill when he did mine, so you might ask him about that. I had my car back the day after I dropped it off, so it was pretty fast.
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