Do you have difficulties in doing the first application exercise ("and the rockets red glare")?
For me it was very difficult: in order to avoid pulled up chest voice (never pull up your chest voice!) my voice was too weak and "empty" (girly and hooty, too similar to falsetto voice).
Here how I solved the problem.
Don't directly do the exercise in its standard way (it can be too difficult):
"mum mum mum mum mum mum...
...and the rockets red glare".
but do it in the following manner, using EXACTLY the SAME sounds you discovered in the previous exercises of the lesson (listen very carefully the explanations of Brett about those sounds):
1
"no no no no no no...
...nuuh nuuh nuuh nuuh nuuh nuuh"
2
"nuuh nuuh nuuh nuuh nuuh nuuh...
...mum mum mum mum mum mum"
3
"mum mum mum mum mum mum...
...(the 6 vowels of "and the rockets red glare"; BUT with initial and final 'm's)"
4
(the 6 vowels of "and the rockets red glare"; BUT with initial and final 'm's)...
...and the rockets red glare"
5
"and the rockets red glare...
...and the rockets red glare"
6
then sing along the sung examples
Passing from 1 to 6, the changhes should be gradual. Doing the following kind of soud, remember the sensations of the previous.
Sounds 1 are very easy, sunds 5-6 are difficult.
And, in general, stay on lesson 3 a lot of time (I had to spend on it more than 1 month, working on it every day).
In my opinion, it is a very important lessono and it is important to master it well.
It si very efective, if well mastered...