I found Mabel's workshop inspiring because there are things to work through when you start taking this approach to life especially the interpretation of 'responsibility'.
Distinguishing the voice of the intellect from the voice of inspiration.
For me (living in an Arab country - though the seminar was in the UK), it was particularly special because in the same room, all attending the same seminar, were Christians, Muslims (in fact it was a Muslim who was key in organizing it in the UK!), Buddhists, atheists.... and people were relating parts of their own scriptural teachings which were giving the same messages.
There are other tools you can use other than the simple statement - and some may work better for you in some cases than others.
No, you don't need any of it, but it can deepen and broaden and support your understanding of what you are letting yourself in for (as I said, imagine you discover ho'oponopono - everything is patterns made up in my own head and then my local world goes off into revolutions everywhere! That's a heck of a lot of 'cleaning' to do!
PS - and just because it's easy to say - doesn't mean it's easy to do! Listening to someone who has had to work through some of this, learn not to intellectualize and so on, helps a lot!
Lately, I've been encountering a lot of 'misogynistic clap trap' dressed up as religion and being perpetrated by the victims themselves! (Anyhow, that's how I see it! Not asking to get into a debate here!) - am finding it very difficult to 'clean' and not go off on a 'rant and rave' marathon. I had to put out a call on my FB to another member here who shares the ho'oponopono outlook to do a bit of cleaning on my inability to clean it if that makes sense!