As far as I know, there are no reliable Clearnet dealers out there and a lot of scams.
Your best bet is the DNM. The vendors on most markets are rated and have stats on sales, etc, as well as customer reviews.
Choose a vendor with a record of high sales and trust level.
Most of the vendors selling F and it's various analogues are in North America.
The dark net isn't really complicated at all. You just need to download a TOR browser and off you go.
The most complicated part for me was figuring out the whole bitcoin thing, but I got it done and my F was safely delivered yesterday.