While looking up some references on amateur nuclear fusion (don't ask!) I found that Raymond Jimenez had written a cute 40 page book on his own experiments with a Farnsworth Fusor. You can apparently order a dead tree version from Lulu for $12.50, but it's also available as a free download.
Deuterium is an easy gas to obtain. I submitted an order with Matheson Tri-Gas: a couple of phone calls and parental approval were all it took.