To adjust the height of a fixture that hangs by a chain, remove or add links. On other types you may need to alter the length of the cord or cable.
A heavy fixture may require a fan-rated ceiling box.
About 2 hours to remove an existing fixture and install a new pendant fixture
Screwdriver, long-nose pliers, strippers, side cutters, lineman's pliers, voltage tester, nonconducting ladder
Stripping wire, splicing stranded wire to solid wire
Spread a drop cloth on the floor and set up a ladder.
New pendant fixture, wire nuts, electrician's tape