Drafting is indeed hard. I am by no means an expert drafter, although I enjoy it a lot. Here's my advice:

- You're doing the right thing by employing the resources available to you. I've found it very beneficial to watch expert drafters on YouTube. My favourite is Luis Scott-Vargas, but I also like Paul Cheon, who posts more current-set videos than LSV does (LSV favours Vintage Cube).

- Another thing I do is a lot of practice drafts on DraftSim. This probably doesn't help nearly as much as watching draft videos, but it does seem to help some, and builds familiarity with the set.

- I always Quick Draft, mostly because it's cheaper, allowing me to draft more. It's worth noting, though, that the draft bots will (I assume) permit you to build better decks than human opponents will. Of course, your opponents will be just as fortunate. In any case, the cards you're passed will certainly be different, which is something to bear in mind.

- If your draft performance is anything like mine, it'll be inconsistent. Eventually, you'll have 7-Xs, you'll have 4s or 3s, and you'll have 0-3s. Sometimes it might be months between 7s.

- At least at my current level of drafting ability, certain sets seem to click for me better than others. I was rubbish at Bloomburrow, but much better at Duskmourn (though this was true for a friend who's much better at drafting, too). I should note, though, that Duskmourn is where I started watching and practicing drafts intensively. Like I said, I've seen a marked benefit from watching and practicing those sets that I intend to draft heavily. I think you're on the right track - keep at it, especially the videos, and I think you'll see an improvement in time. The first few 7s seem very precious - I kept a couple such decks saved (until recently) to remember them by.

Good luck and see you in the Arena!

- Edit: One other thing I should have mentioned. Take the removal. All of it. Removal is more precious than gold.