Hello enchant, I've pick up your 2 PMs to me this morning and I'll try to answers your querries here.
You ask if you'll need to do a test piece of 36 rows.
If you are the type of person who needs to see the full extent of the diamonds knitted up, then yes, you will need to do 36 rows. If you are the type of person who can knit part way and then visualize the rest then no, you wont need to knit 36 rows.
You say that you are knitting through the back of the loop but you're holding the yarn in your left hand, not you right hand as shown in the video.
Assuming you're knitting right handed (ie the stitiches start on the needle in your left hand and are worked across to the needle in your right hand) this just means you're knitting Continental Style.
Your third comment is that when you wrap the yarn on the knit stitch you are taking the yarn over the needle, rather than under it (as shown in the videos).
I know that knitting through the back of a stich will twist it. Unfortunately, I don't know if wrapping the yarn the way you do will twist the stitch more or straighten it out.
I agree with Salmonmac's comment that if you're happy with the way you knit and the way it looks carry on.
Remember, once you find your own way of knitting, if you meet someone who knits the same way (Continental, English etc) there will be slight differences in the way you both do your knitting, but you'll both be 'Right'.