This shivery goose bump raising stuff is definitely too soon, imo, but if you must know more, check WIKI on the subject to find that Hollywood movies notwithstanding, cremation doesn't do a very good job on bones at all. Apparently they have to use a bone crusher to satisfactorily grind you into ashes. Then there's all the rest of the detritus, jewellery, dental fillings and other such, that apparently the crematoria sells for scrap metal.
A backyard incineration might make you unidentifiable but only until the DNA results are available. I suppose cause of death would be difficult to determine though unless knives or bullets grazed bones. It's all too gross and too late for this. I'm going to give myself nightmares.
Anyway, for anybody seeking a morbidity high, this link definitely oughta do it.