trade is automatic. you only send traders in CoT which is 30 second job every 50-100 years 
As someone who has far too many hours of EU3, EU4, and CK2 racked up, I can confidently say that while CK2 certainly has all sorts of complexities that EUx lack, it also has much better discoverability - and it is discoverability that underlies "user-friendliness".
You are not really helpful. I tried to learn. Too complicated.
EU is a different game from CK, much the same as they are different from Vicky and HOI*. Each game has a certain core style that separates it. For CK it's the pseudo roleplaying mechanics, and the focus on individual characters and dynasties. For EU it's focus lies in exploration/colonization and the birth of larger world spanning more unified countries. Vicky is focused on industrialization, different population classes and politics. Lastly HOI is war, production and logistics. Maybe EU4 isn't gonna be suited for you, but, since you already have it, you should stick with it for awhile, many people really enjoy it. Check out some of the tutorials/beginner guides on the wiki, and feel free to ask questions.I am with you there. I just bought this game today and I must say am highly disappointed. This is not at all user-friendly like Crusader Kings 2. And i couldnt understand the trade mechanics either. How do you try and control the trade system? I was researching that right now. You cant even control or customize your rulers. You play as a country alone not an individual.![]()
I'm not much of a fan of trade either. Not in this game anyhow. What I usually do is, as France for example, have one of my merchants collecting directly from Bordeaux, which is the trade node France owns (has most power in) and send the other merchant to direct trade from Seville (which Castille/Portugal own) to Bordeaux. I think this increases the amount of money your Bordeaux merchant collects.
And that's it. I don't put any more thought into it than that. And I figured that out myself! So if I can figure it out then so can you.
You are not really helpful. I tried to learn. Too complicated.
I didn't even bother with trade in my first few playthroughs. It is far from essential if you start out as a continental power and you can slowly get more familiar with the way it works.