wormey
You could start the "worm farm" slowly by adding not too much compost at once.The "brandlings/tigerworms " -the ones that have yellow stripes-are true composters.They live only in small numbers in the top layer of ordinary soil.
Provided that your lot is not brand new i.e.has some natural growth on it they are already there.All you have to do is to provide them with optimum conditions.Shelter against birds,mice ,rats,drought,frost,excessive heat etc..The easiest way achieving this is to build a "New Zealand box/bin". That is a simple 1 cubic meter box without a bottom but with lid.Put some chicken wire mesh-the smallest gauge-on the undisturbed soil(mice,rats) and secure it to the sides about 1 foot above soil level.Feed and wait.To make them more comfortable you could cover the compost directly with a piece of corrugated cardboard before you close the lid-that will keep the moisture and the heat inside.Don't forget to water it (!) before you go on a summer holiday.
It worked for ages in my gardens.