I'm not sure how one would tie a cow hitch when using two separate lines.... but... learning to tie the proper bowline will eliminate much of the "hang up" problems some people fear.. (that's where the bitter end of the knot is INSIDE the loop... but the most useful way to avoid those hang ups is to learn to tack properly... that is, allowing the wind to push the sail through the fore triangle, rather than trying to pull it through with the sheet.
I have big opinions on the single line, cow hitch method that are all over the archives (as people roll their eyes

) so I'll spare all of y'all from that.