If you can, use downward expansion rather than noise gates as this will make it sound more natural. You will still need to use compression, but keep it gentle with a fairly fast attack and release. You will find that people talk over each other so everything has to sound natural.
A very simple trick that I like to use is to alternate the phase of mics that are next to each other, obviously this depends on the distances between the mics, but it can help with separation.
I will also use subtle panning for the mix so that the listeners can use a bit of the cocktail party effect to keep track of who is saying what.
The last thing is to work in shuffle mode when you are editing and make lots of notes during the recording so that you have a head start with what needs cut out rather than having to transcribe the lot before editing.