Yogurt Question

I've been wanting to try making my own without a maker for some time... but with all my microbiology knowledge I'm too chicken.

Today I stumbled upon a cheap, but older, yogurt maker.  Here's where I need your help... do any of you make your own yogurt?  Do you use a maker, or do you make it on your own?  Would an older yogurt maker do the trick??? 

Thanks!