Hi there--
I just wanted to chime in a couple of things:
--Remember that sleep training isn't about you soothing your LO; it's about giving your LO a chance to figure out how to self soothe.
--Even if he's not talking a lot, he can still probably understand a you just fine. Explain before you even go into his room what is going to happen using simple terms. Keep you tone confident and reassuring.
--Personally, I'd try wi/wo. At this age, when I walked in, personally, I'd use only my voice. Since your hand has become a prop, any patting, etc. may just be sort of a tease--tantalizing him that you might keep your hand there until he's asleep. Yes, you wi/wo as many times as necessary. When you walk out, stay out long enough to assess the direction of his cry. If it's a genuine "I need you" cry and it's escalating, walk in, say something reassuing, and walk back out. Don't wait for some prescribed amount of time. Go in based on the quality of his cry. I had to do some wi/wo with my DS at 18 months and I found that he did an angry holler a lot. It was not a genuine I-need-you cry and if I went in for that it tended to make him angrier. It was sort of his new mantra cry. And yes, keep it up until he's asleep, even if it's 2 hours. Don't ever get him out of the crib.
--At this age it is not uncommon for LOs to only require 13 hours of sleep. If you're getting 1.5-2 hour naps, I'd plan for an 11-11.5 hour night.
I think it's a great plan to wait for the weekend when you can really commit to being consistent. Sending your {{{hugs}}}--sounds like you're having a really tough time.
Bethany