how? do you have any exact links for a guide? like just download cracked rpg maker packages and then EDIT with google translate everything?
You generally need to have at least some understanding of the language in question, especially Japanese. There are quite a number of Japanese phrases, terms and soliloquies that just don't have a direct translation into the English (or any other) language. Remember Naruto and that "Datebayo" thing he shouts in the Japanese version? There isn't actually any direct translation for "Datebayo" into English, at all. Going on what we know about it's usage, it's always used as a self encouragement statement but to others, so it became "BELIEVE IT!" in English. In most situations, "You got that?" would also work.
Not to mention that many Japanese phrases have entirely different meanings based on the circumstances surrounding it. The phrase "iku" (行く " is one of these, normally in polite Japanese it means "To go somewhere", but it has a dual meaning as the the expression "I'm going to heaven!" which is normally used where in English you would say "I'm cumming" so it gets translated into "I'm cumming" more often than not. A direct translation would just be "go to heaven" if someone else is telling it to you, or "I'm going to heaven" if you said it, and in both cases it represents "I'm having an orgasm". This means you'll see(行く mid sentence quite often when it has NOTHING to do with anything sexual. A machine translation will take none of this into account and give you the strictest, basest definition of the words. Half the time this'll come out to be nothing more than word salad.