Clay is a game changer for sure. I first tried out clay about 15 years ago, and now use it every time before I embark on an enhancement detail of sorts.
Also, these days you also get synthetic clay products. There are clay towels, clay mitts and also clay scrubbers (sponge wrapped in microfiber with synthetic clay material on the one side). Generally the consensus is to use a clay bar once, or maybe 3-4 times at most before it breaks down too much and needs to be tossed. With the synthetic clay towels, they have many more cycles in them before they need to be tossed. The reason for this is they can be rinsed out. I'm currently using a clay towel, and I've lost count but must be nearing 20 cycles.
I also recall once upon a time, I purchased a fong kong clay bar for R35 (when regular bars are R300+) and it was utter crap, rubbery and useless. I actually didn't even use it.
In terms of clay lube, yes soap will work. But I've also tried this with clay bars before and it just mushes up the clay, making for a negative overall experience. I personally stick with my own mix which is a rinseless wash product called Optimum No Rinse (ONR) diluted with distilled water. This has a polymer composition which provides extra slickness during the wash / clay process.
As I've said earlier in this thread, I geek out on this stuff to a large extent, and have access to a huge range of products, so in theory I don't have to take shortcuts.
Also on the topic of sealants, I myself am not fond of the Meguiar's Hybrid Ceramic Wax, I find it a mission to buff off again and there is no shine. My unsung hero is Menzerna Powelock Ultimate Protection. It's relatively inexpensive based on how much you use and the slickness is (insert Youtube lingo) super-crazy, lol.