A full door swap is not a good candidate for a homeowner project, on Longboat Key or anywhere else - the spring under tension is the part that puts people in the hospital, not the door panel itself. What's specific to this island is the finish level: if you're putting in a heavier insulated or composite door because that's what fits the house, the spring sizing math changes, and guessing wrong means a door that won't stay open or a cable that snaps under load. If your project is really just swapping a worn opener or adding a keypad on an existing door, that's a smaller job and more reasonable to take on yourself. But full door and track replacement - sizing the spring, setting the header bracket, squaring the track to an opening in an older frame - is where we'd tell you to call rather than guess.