madali lang yung body grounding. any auto electrical shop could do that for you. the simplest way is to add a connection directly from your battery's (-) terminal to car's body. now if you want to follow the grounding techniques, just take note of the grounding points :

(quoted from ARL)

1) battery to body - gawa ka 2 o 3
2) distributor mounting bolt
3) dun sa bakal sa gilid ng cyl. head (yung ginagamit kung ibaba yung makina), parang hook
4) sa block - best place is dun sa bolt ng engine support na nakakabit sa block
5) sa mounting bolt ng block sa tranny, malapit sa starter

di naman dilikado yung procedure eh.