Where to begin. I have read the last 2 hours on past threads on here about lighting. What is the difference in c7 and c9's besides the size. Some say you need to buy a 1000 ft spool and then add lights, others say they buy it all as one. The clips on roofs, gutters all seem different to me. And how do you hook up all those lights without ever overlapping - like the string is one continuous run of lights everywhere. Can I buy from someone or place that doesn't require manuals, DVDs, or franchise fees? Some say I need 100 ft extensions cords, others say 3ft? Any info would be great. I would like to expereiment with my house and maybe brother in law but I would like to work with the lights to get a feel of what I am doing or suppose to do!