Having a friend help you swap out a few outlets is probably not an issue, but if you are thinking of anything more complex, like adding circuits or upgrading the electrical panel, hire a competent local electrician. Even if your friend is a licensed electrician, is he familiar with European electrical codes and any local special requirements? Does he know when RCDs and GFCIs are required? St. Maarten must have a very specialized building code given that's it seems to be a weird hybrid of European and US standards. Don't they use DIN panels? Will he be able to pull a permit? Get the work inspected? I'm sure your condo neighbors will not be happy to have any significant electrical work going on by someone not intimately familiar with local regulations.