Another tip, after you do your first loop and get it braided/twisted down until none of the ends are left, use a bread tie around the string. It will hold your work while you get all the twists out of the 2 bundles.
One thing that confused me when I started was the term backtwist. What direction is that?
If you are right handed and did your first loop in the normal direction, put it on a peg and lay your bundles out after getting them untwisted.
Looking from the loose bundle end towards the loop you just did that is on the peg, twist each bundle 25 to 30 twists clockwise.
Another thing to look at is when you are doing your second end and you have braided down past your loose ends, check your bundles and see if their are any twists left. You may have to keep braiding until all twists are removed from the bundles and they are running parallel.
Then you can start adding your turns to the whole string.
Also, don't get your twists backwards. If the twists are in your left hand, individual bundles in the right, give the top bundle a clockwise turn, then bring it forward towards you to the bottom and the bottom away from you to the top.
Individual bundles get a clockwise twist and then bundles are rotated together counter clockwise when viewed from the right.