Joining Yarn

I have always struggled with trying to join yarn strands invisibly...

Recently I came across several methods on Pinterest - so I saved them to my knitting tips board.

Now that I'm working on a sweater for myself, I've had occasion to try one... .

Here is the illustration of what to do.

I've tried it twice so far in this knitting project. The join seems firm - and so far, hard to detect. Hope it doesn't unravel over time!