I did my boat this past spring. There was a heavy dull white oxidization in some areas...enough so that I did a 400 & 600 wet sand before compound.
You can do it yourself and learn as you go. Start with a good buffer. I like Makita, others prefer DeWalt, Porter Cable, etc. 3M has a nice series of products to get the results your looking for. The rest is your time.
The set-up will be costly at first, but a heck of a lot cheaper than having someone do it for you. Spend the money on the good stuff and you'll be happy you did.
Hello, my name Ryan!