Firstly, do I really need to much about with putting liquid sealant into the tires? I get the idea but not really keen on it if I can avoid it.
No you don't have to UST rims/tyres cna be run "dry" if you like, but if you manage to pick up a small hole in the tyre then it won't self seal, one of the major benefits of UST (if used with sealant).
Secondly - tire pressures. I thought that one of the benefits of tubeless was the ability to run lower tire pressures. I usually run somewhere around 30psi on regular tubed tires but the new tubeless tires say they should be inflated to between 35 and 60 psi. That sounds pretty high to me.
I'd say treat that as manufacturers recommendation rather than Gospel, TBH it's there to be ignored... Start at whatever pressure you normally run (30psi wasn't it?) and then see how it feels then maybe try it at 25psi see if that's better or worse, you've just got to experiment really.
The balance you are trying to strike is Grip, Traction & Comfort Vs Rolling Resistance, pinch flats shouldn't really be part of the equation any longer... Oh and whatever specific pressures someones mate of a mate down the pub or a fella of the interweb says is "Perfect" ignore them, go with what you find suits you best.