Reddit reviews Friendly Introduction to Mathematical Logic, A
We found 2 Reddit comments about Friendly Introduction to Mathematical Logic, A. Here are the top ones, ranked by their Reddit score.
I would learn some mathematical logic (Enderton, Leary or Chiswell and Hodges are the usual suggestions. I'd avoid Enderton's, personally), and then come back to Kunen or Hrabeck and Jech (pdf). If you're feeling particularly ambitious, Jech's other book (pdf) is the reference for working set theorists, so may want to take glances at that while reading Kunen or H&J.
Leary was my favorite. He skips over the propositional calculus, but I imagine you'll be fine having had a little exposure already. It's unfortunate that it's out of print, but I'm sure you can find a cheap copy.