How do you drive a CAT D6-B bulldozer? Which levers do what?

I am looking at buying a Catapillar D6-B dozer (which is a bit of equipment at a deceased estate), to clear some land but I have never driven one before. How hard can it be? Surely all I need to know is what levers do what, ie stop, go, left, right, clutch, blade up/down, rippers up/down. Everything else should be common sense, watch the gauges, keep it full of oil, gease, hydraulic fuild, diesel, water etc.