I'll also leave some of my notes here:
I have to trust concious decisions that use arguments based on past experience (memories/knowledge).
I cannot deny it, because to do that I would have to trust a concious decision that uses arguments based on experience.
Even if I had only the current reality (what I'm currently experiencing), then why care about doing anything else than trusting my concious decisions?
At the current moment in time I am either:
a) meditating, just taking what's happening in, what I see and how I feel
b) trusting my concious decisions based on past experience
[trying to answer the question above takes me from a to b]
"What if I'm wrong about that" is not an argument, or a reason to search for an argument. I might aswell say "what if I'm right about that".

Feel free if you have anything interesting to add

Circular reasoning works

That's good to hear.
The concept of "something works because it works" feels strange and suspicious(?), so it makes me anxious thinking that it may not be right, even if I don't see a way how. Maybe that's because I've been struggling to come to these conclusions for a week now, which involved a lot of doubting of what I know for sure, which caused me a lot of stress and anxiety. So it might be a habit I developed of spotting something hard to wrap my head around -> anxiety. I hope it will go away over time.

We know from experience that nature is reliable, given the same conditions the outcome can be almost exactly the same (only at small scale of quantum effects the outcome can be unpredictable but the probabilities still hold well).

But the reason I believe that is true, is because past experience shows me it has always been the case, so again I trust experience because it tells me that it should be trusted - and my problem is that I don't know if that's the only argument there is for trusting it and if it's good enough.
I think all your following advice naturally holds true but only if I trust past experience as reliable for making decisions.