I have having the worst freaking month and dont want to mess this up too.

So, I was changing out the oil pan and when reinstalling the exhaust header I hand tightened all the bolts except for one. I am not able to put it by hand it slightly goes in and then gets really hard. If i use the ratchet it starts to go in very easily. no force necessary (weight of ratchet???). I am wondering if I should just keep on going or should I buy a tap and die set and use it to clean up the threads. I am really low on cash right now but really dont want to screw things up. Any advice is appreciated.

I can see that that the thread is very slightly off and took a picture but you really cant see it in the pic. I can post it if it helps.

I believe this is the last bolt that I removed when removing the header. Maybe the weight of the exhaust caused this?