I'm not familiar with the books, so I couldn't really comment on that, only to say I don't think it sounds particularly helpful to be honest, I think the relationship with your child would come more naturally if you have a better foundation for it, saying words and expecting a textbook response from a small child who has parent specific behavioral issues is never really going to work surely?
I've got a four year old, it really can be challenging, but things like saying 'get out of my way' is perfectly normal.. they don't really have the capacity to consider how the bluntness of that makes you feel, the need to get over 'there' and you're in their way, so their solution is to tell you to move, the key thing is to not move, or to stop them in their tracks.. if you move or allow them past then you have taught them that rude bossy behaviour works, when really it should be corrected 'that's rude, if you want to get past you need to say excuse me, would you like to try again?'.
I will not tolerate my DD bossing me in any way, so I pull her up every time, we're going through the I WANT phase right now, she doesn't mean anything by it, it's just the quickest way of asking for things, I don't get mad or annoyed, but I correct her every time on that too, I never give her anything that she demands unless she rephrases her question with manners. Honestly, it is bloody exhausting, and I get sick of the sound of my own voice sometimes, but IMO it is so important to set the foundation of respect, and teaching effective consequences. Interestingly enough, her dad (we all live together) is more lax on what he tolerates and he struggles with her not listening to him quite a lot, but it is down to his 'I just want an easy life' parenting style.. he doesn't seem to realise that minimum effort equals minimum reward.
With you saying, 'what then' after saying no firmly, that is what you need to figure out, but whatever it is it needs to be effective and consistent, my biggest change last year was actually 'collecting her' if she doesn't listen, I ask her to do something, give her one more chance then I go and take her hand, I don't ever pull her, but I stand there and say 'come on we need to do x,y,z' and I won't let go of her hand until she does what I need her to.. she knows at that point she can't carry on with whatever she was doing anyway and she comes and does what I need her to, I read it somewhere and I was genuinely amazed how well it worked, now I rarely have to go and get her, as she usually comes on the first or second chance, but I never ever repeat myself three times as it defeats the purpose of what she has been taught, I was finding myself getting angry at her and frustrated and then feeling guilty, then that one tiny change eliminated all that completely.