Trust me, the you-tubers have a tail - it just gets edited out. When I knit the first few stitches, I use the tail and the working end, just to set the end. You just have to remember when you go back along the first row that the last few stitches have two threads instead of one. Leave the tail hanging until the piece is finished, then just weave it into the first few stitches next to it, tie it off against a stitch on the wrong side and snip the end close to the knot. It will only be noticeable if you're looking for it. Or you can knit the whole tail in - just mark where the tail ends so that you remember that you have two threads per stitch.