I am a very handy guy I think

. I do all of my own exhaust install but this will be my first time changing out a header. I read some past threads regarding header install including camaromodz but I just want to see if I can get some more important tips on installing the header right. The main thing that I am concerned with is using the right hand tools to get the header bolts off and the oxygen sensor, I am not sure if I should use something like a 2ft breaker bar to help me loosen the bolts on the header. I only have just about 1500 miles on my car so maybe the bolts are still fresh making it easier to get them off.
Let me also mention that I have a v6 and not the v8, I decided to post here since there are tons of you guys that changed out header vs us v6 guys, plus I think the process should be about the same.
So any help and tips to help me with my upcoming install would be much appreciated