When I've crimped my 1/0 terminals, I've used a table vice to do the job. They hold like no other and it leaves a pretty cool design on the terminal too. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
If I worked on my car more or for friends I would invest in one of those hammer crimpers. But I rarely work on my car so I usually just use a flat head and a hammer. Or set screw terminals.
Get your wire used and you can do it for like $20-25. I lyke teh used wire //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
and personally I use a vise for my large wire crimps.