I'm writing this after having reduced a board by an inch or more in width, having been unable to joint it square.
This happens every project that I attempt. I cannot joint a 3/4 board square. I am always, invariably, twisted to one side, and after hours of toiling, I just wind up reducing the width to the point that it's unusable.
This is easily the most frustrating aspect of woodworking. I dread starting any project where I have to square up the stock. Ok, well, I know I said that about sawing square, and that might be up there as well, though I am getting much better at that since I started using knife walls and a tenon saw.
I notice a few things when I'm hand planing the edge of a board:
1) I always taper the board away from me if I take full length strokes. If I take short strokes starting at the far end and working backwards, as I recently learned, it sort of helps, but I have a hard time getting the plane to bite to the same thickness as it did at the end (I assume because it's in a sort of concavity at that point), and I just wind up adding more inconsistencies and twist because of all of the uneven strokes I'm taking.
2) I can't feel vertical. I always, invariably and without fail, find myself planing lower on one side, or worse yet, imparting twist. Trying to correct this, I will literally spend hours and come away with nothing more than a board that is an inch thinner and still out of square.
I have ensured that my plane iron is square. And, I understand that to make corrections, you are supposed to overhang the edge of the plane, take a pass or two, and then go back down the middle. Invariably, I will do this 3, 4, or 5 times and find no difference, then go back and try again and find that I've imparted twist or over compensated, etc. etc.
It baffles me that I can spend an hour or more doing this, and never even happen upon squareness by accident.
I'm wondering if, perhaps, it's not to do with making corrections, but planing square to begin with. I can't feel square, and I don't feel that I have the control of the plane that I should have. I've tried both heavy and light touches, and oh so many ways of gripping the thing. The lighter I go the more feeling I have (though, I still can't really tell if I'm vertical), but the less the plane bites at the start of the board, leading to more of the taper problem. Moreover, and I thing the biggest problem, is that the width of the board is so narrow that it's very difficult to balance my plane perfectly on top of it. I have somewhat better luck jointing 2" stock, though even that is not easy.
I'm half tempted to just make a jig to clamp on the side of my plane, as much as I'm embarrassed to say. Or maybe jointing with the board horizontal, as I've seen some Japanese joiners do. I would rather develop the skill to actually feel and plane straight, of course. I have, at this point, read all kinds of advise, and watched all kinds of videos on the subject, so I don't really know what I'm hoping to gain by posting here.
I'm also half of the mind to record a video of myself. Maybe someone can spot what I'm doing wrong better than I can.
As an aside, I can get fairly square IF I have gauge lines to work to. But that first edge will easily have rendered my board far too narrow (and me far too frustrated!) before I ever get it square. This leads me to believe that it's the lack of any reference or ability to feel "square" that's getting me. I kind of feel like I'm balancing the plane on a see-saw whenever I'm jointing.