Cords (any size) Linhasita thread, waxed thread...
 connectors, natural pearls...
 a lighter, a wire burner

To start with, cut a thread about 50cm long, so you'll be comfortable. Once you've mastered the technique, you'll be able to adjust the size just right.

Tie a simple knot in the center of the cord, then thread the bead. Make a second knot on the other side of the bead to secure it. To tie the knot close to the edge of the bead, use a needle threaded through the knot to slide the knot closer to the bead. Tighten, then remove the needle.

The node:

Place the cords in the shape of the bracelet, with the 2 ends crossing. If you wish, you can insert a pearl on the 2 cords to help the crossing.

Thread the bracelet to determine the size and approximate location of the knots. 

Follow the diagram above for guidance.

Pass the left-hand cord under the right-hand cord, then bring the left-hand cord back to form a loop. Hold with your right hand.

Then wrap the cord around the 2 cords for 2/3 turns. You can tighten the turns, no need to keep them wide.

Finally, pass the cord underneath to enter the starter loop.

Gently tighten the knot. Next, cut the cord to within 2mm of the knot, then burn the end, taking care not to touch the knot. The end will melt, so press with your finger to stick the end to the knot. This will prevent the knot from unravelling. If you wish, you can also place a small dot of glue on the knot.

When you tighten the knot, it will move, and the trick is to get it in the right place. To do this, plan to start the knot in front of the predefined zone, because as you tighten it, it will move further away. Practice on a test cord before making your bracelet.

For the second knot, proceed in the same way with the other cord. 

There you go! Beautiful creation!