The first and usually only step is to download all your transaction data from Neon and import it into Koinly. There are a couple of ways you can do this:
If you want to use CSV files, you have to make sure to import your deposits/withdrawals and trades for ALL years - not just the current one!
That's it. The only other thing to be vary of is to tag your airdrops/forks so they appear as Income on your generated cryptocurrency tax reports!