I haven't tried doing it myself but having bought one like this:

Dendrobaena 200ltr Wormery -The 'Mega Tower' Composting on eBay, also Composting, Hand Tools Equipment, Garden Plants, Home Garden (end time 19-Feb-08 07:52:15 GMT)

I really don't think it would be hard. For me it was worth it really not to have to faff about but it's certainly not high-tec!

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