A hot air paint stripper gun and a stainless steel bowl. Do it fast so the first crack is in about seven minutes. Roasted beans should be used between 4 and 10 days after roasting, so don't try them straight away and be disapointed.
Start with Brazil aribica (spelling) beans are they are the easiest to get good results with.
And yes, there are a lot more expensive and better ways to do it too.
And have fun