Doing it when your heart is not in it is almost the definition of discipline. Thanks for posting.

Get the big point of the video — a grid reminds us of line directions. It’s not to make it more complicated, it’s to make it easier — the training wheels of perspective drawing. Look at the form studies you did from blobs. Did all the lines go in the correct directions? Probably not. Even masters run into that loss of orientation for exactly where all three axes aim. This takes care of that. Choose a grid. Any grid. Use your instinct. Draw form studies on it. You can redraw your old ones, or create new ones, and you won’t have to worry about how to position the lines. Now you can put your attention onto our current difficult challenge: proportion! Regarding making up your own grids: do it if you’ve got an idea for one, and know where you want the lines to go, and if you don’t mind that they aren’t “scientifically accurate. These printed ones are. But if you’re having trouble with ready-made grids, wait. Inventing grids requires you to make decisions which seem to be confusing you — though it may help sell you on the pre-made grids. Falling off the bike a few times might prompt a new appreciation for training wheels. I hope this helps.