Mike
There are some paint experts on here - so they should have some good advice... but I'll say the little bit I know.
I add a couple drops of dish soap in my sanding water - this helps keep the water/wet in place and helps to keep the paper unglogged. I use a 5 gallon bucket and dip the paper (with the block and all) in the bucket constantly to float away the sanded particles - and to add new water. I also use a small squirt container - like a plastic ketchup bottle, if you know what I mean.. to rinse the area.
BE REAL CAREFUL to WATCH the high and low spots -- you'll see the high spots go "dull" and the low spots will stay shiny.... you do not need to get the entire area "dull" because you will also "cut" some of the high spots down with the buffer.... ALSO -- don't sand near edges - tape them off so you don't cut into them. Ditto that with the buffer.... you can clean them up by HAND when you're done with the bigger area.
Depending on how much orange peel you're dealing with - I'd go with the finer papers -- unless it's got lots of clear on it. Being a "newbie" you'll tend to sand off too much I think... better safe than sorry.
Just my .02 worth...
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