It's all a matter of patience. You just need to know how to select points, weld them together, select faces so you can hide them and then delete the stuff that's hidden. Really just a bunch of grunt work once you get a feel for Meta.
Here's a quick gallery of game meshes that I made with DoGA/Meta that I'm making for a friend. They still need textures, but you might recognize the geometry from FASA's Renegade Legion: Interceptor.
http://www.geocities.com/tzircher/renleg.htm
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TAZ
I've tried to teach Meta before. The absolute best way I have seen so far is to use something like Remote Assist so you can both work on the same the program at the same time. But, I've found that really requires that both ends have broadband to make it work smoothly.