One more I'll add: document who discovered each IOC and from where. The documentation often slows down jumping to conclusions and if you need to unravel a chain of false IOCs, it will be MUCH easier.
If you're investigating a security incident - do everyone a favor a ensure you do/don't do these two things.
DO read all the log events in their entirety
DONT make logic jumps assumptions to tie pieces of evidence together when there is no evidence.
You will save so much time.