I find it happens accidentally for me. I have been using one of those municipally provided black composters in the tiny piece of urban backyard I have available. If I got the ratios perfectly right, I could get it to hot compost.
What happened, though, was that we got a Flemish Giant rabbit. We use a bedding product made of recycled and waste raw wadded paper, which upped the
carbon content considerably, kicking the hot compost conditions to the curb, except maybe for a little right in the centre of the pile.
What I noticed instead of a hot compost the first time checking the composter since beginning to add the rabbit bedding and waste was that the bin was teeming with all sorts of life, but mostly springtails and others I recognise from healthy, compost-rich soil. The worms were obvious the moment I began to turn the pile. I even found some mating near the base of the container.
I am constantly surprised when I visit the composter now. It takes about a week for the worms to turn and incorporate a full litter box (we use one designed for large cats), and perhaps another to leave no trace of paper whatsoever. I think the paper content helps maintain a relatively constant moisture level, and the composter is sitting on bare soil, so the worms can move up and down the soil column for
shelter should they need it.
I like ground-connected outdoor vermicomposting, as the worms can always escape to more hospitable conditions, should the bin become unlivable for any reason. There's also more leeway for things like sub-optimal odiferous events, which can happen when you make additions or adjustments.
Also, if they're in the soil column, and if I put only semi-finished compost in my beds, under my mulch, the worms venture out and find it, and keep on doing their thing. They are the hardest working livestock there is.
-CK
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein