Examine the Installation
In addition to the wiring work, installing recessed light fixtures requires cutting into the ceiling surface, mounting the new fixtures (typically to the ceiling framing) and any patch-up work where old fixtures are removed. Attic access above the ceiling makes it easy to install wiring and standard fixtures. If the ceiling is enclosed (the space above is inaccessible), you'll probably want to use remodel-type fixtures that mount right to the drywall. The wiring may or may not be more complicated with enclosed ceilings.