I need to re-kit my two Thunderbolt 800 Carbs but I was told by someone here that they are very tricky and I should just take it in to have it done. I have re-kitted auto carbs years ago and would like to save the dollars of having a boat mechanic do it. Is what this guy said true or is it worth my while doing it myself? If so, is there anything I should know first? I am also planning to do the water pump and impeller and the fuel pump diagram.