Regarding manifesting, there are many different techniques that you will come across. Ultimately I think each person needs to try different things to see what works for them and there is no one way to manifest. Just remember the goal is to be able to "live in the end" as if you already have what you want and detach from the outcome. Whatever you are doing - scripting, visualizing, etc. should make you feel good. If it ever feels forced or makes you anxious I believe you should take a break. Just remember that none of the coaches know exactly the formula - they are basing it off of their personal experience and clients experiences.
Personally I mostly visualize, script, give gratitude and meditate. But like I said before, I think the most important thing is first dealing with your limiting beliefs.