I’ll take a stab at this even though I’m still somewhat new to all this.
You don’t need to prioritize things, but I find it helpful. I don’t necessarily prioritize things in order from most pertinent/important to least, sometimes it’s “what is easiest for me at this moment” or “what do I feel I have time to work on”. Do what works for you and what feels good to you. If working on a particular thing feels stressful for whatever reason, you can always come back to it later.
When I lost a book (my copy of NoPR, actually), I didn’t do anything big to find it again. I just imagined myself randomly looking around and seeing where it was, and it worked out.
I’ve been working on my physical appearance too, with mixed results (but they’re only mixed because I’m not focusing on it as much as I should and I still have some beliefs holding me back). With physical appearance I find it useful to imagine myself having a conversation with someone, them complimenting me on how I look different and me saying how easy it was and emphasizing the results. I basically pretend it’s something that’s already happened and I’m reaping the rewards of it. You can do that in whatever way feels good to you (you could just imagine your body how you want it to look), or find another method that works better. I find it very helpful to focus on the results and not the actual physical way I’m going to achieve what I want.
When I was trying to find a job I would actually enjoy I did desire manifestation for it again. Similar to with my physical appearance, I imagined it had already happened and I was enjoying the benefit of it. I was a lot less specific with that because I wasn’t sure what I wanted, but I focused on the things I knew I did want.
Fears and changing core beliefs are things I have less advice on (I’ve mostly been playing around and focusing on superficial stuff unless I’m confronted with something I absolutely need to remedy ASAP), so hopefully someone with more experience than me will chime in. One thing I’ve found helpful with changing beliefs is repeating whatever new belief I want to supplant for like, five minutes or so. And when I find myself focusing on the old belief outside of that exercise I turn my mind to the new one, deliberately.
I think you should start with whatever feels good to you at the time. Sometimes I feel overwhelmed with how much I want to change, and it makes it easier to just focus on whatever one feels enjoyable and fun and not worry about the rest.
I saw you posted this to the facebook group too (I think that was you anyway), so hopefully people are giving you good advice.